Atom Molecule Particle Čerstvé

Atom Molecule Particle Čerstvé. Eg ch 4) and molecules of elements (eg o 2). A molecule is made up of atoms, and they can be considered as particles. The "atomic number" of an element. Therefore, the composition and size of the particle can vary depending on the situation. When atoms and molecules lose or gain electrons, they form ions.

Nejchladnější Classify Atoms Molecules Elements And Compounds Worksheet

I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound.

When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…

Hydrogen is also an element; Molecules are made up of groups of atoms. One sub atomic particle can also be divided into more particles. Hydrogen is also an element; When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…

Molecules are made up of groups of atoms. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Jan 08, 2012 · for example, we consider molecules as particles at some point.

When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…. There are sub atomic particles in an atom. An ion is an electrically charged particle, formed when an atom or a molecule.. One sub atomic particle can also be divided into more particles.

Can you differentiate between atom, molecule & particle? I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Jan 08, 2012 · for example, we consider molecules as particles at some point. A molecule is made up of atoms, and they can be considered as particles.

Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Jan 08, 2012 · for example, we consider molecules as particles at some point. Can you differentiate between atom, molecule & particle?. A molecule is made up of atoms, and they can be considered as particles.

When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. The "atomic number" of an element. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter.. Molecules are made up of groups of atoms.

When atoms and molecules lose or gain electrons, they form ions. When atoms and molecules lose or gain electrons, they form ions. Hydrogen is also an element; When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Molecules are made up of groups of atoms.. An ion is an electrically charged particle, formed when an atom or a molecule.

A molecule is made up of atoms, and they can be considered as particles. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… One sub atomic particle can also be divided into more particles. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. Eg ch 4) and molecules of elements (eg o 2). When atoms and molecules lose or gain electrons, they form ions. Molecules are made up of groups of atoms.. There are sub atomic particles in an atom.

A molecule is made up of atoms, and they can be considered as particles. . The "atomic number" of an element.

Eg ch 4) and molecules of elements (eg o 2). I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. An ion is an electrically charged particle, formed when an atom or a molecule. Can you differentiate between atom, molecule & particle? A molecule is made up of atoms, and they can be considered as particles. There are sub atomic particles in an atom. Eg ch 4) and molecules of elements (eg o 2). Jan 08, 2012 · for example, we consider molecules as particles at some point. The "atomic number" of an element. One sub atomic particle can also be divided into more particles. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound.. Hydrogen is also an element;

Molecules are made up of groups of atoms. Molecules are made up of groups of atoms. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Hydrogen is also an element; A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. An ion is an electrically charged particle, formed when an atom or a molecule. One sub atomic particle can also be divided into more particles.. When atoms and molecules lose or gain electrons, they form ions.

Hydrogen is also an element;.. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. One sub atomic particle can also be divided into more particles.

Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter... When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Eg ch 4) and molecules of elements (eg o 2).. An ion is an electrically charged particle, formed when an atom or a molecule.

One sub atomic particle can also be divided into more particles. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. When atoms and molecules lose or gain electrons, they form ions. Therefore, the composition and size of the particle can vary depending on the situation. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Can you differentiate between atom, molecule & particle? There are sub atomic particles in an atom. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…. Jan 08, 2012 · for example, we consider molecules as particles at some point.

Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Eg ch 4) and molecules of elements (eg o 2). When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Jan 08, 2012 · for example, we consider molecules as particles at some point. Molecules are made up of groups of atoms. When atoms and molecules lose or gain electrons, they form ions. There are sub atomic particles in an atom. Hydrogen is also an element; An ion is an electrically charged particle, formed when an atom or a molecule.. One sub atomic particle can also be divided into more particles.

When atoms and molecules lose or gain electrons, they form ions... . Molecules are made up of groups of atoms.

Jan 08, 2012 · for example, we consider molecules as particles at some point. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.. Molecules are made up of groups of atoms.

Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… When atoms and molecules lose or gain electrons, they form ions. An ion is an electrically charged particle, formed when an atom or a molecule. One sub atomic particle can also be divided into more particles. Can you differentiate between atom, molecule & particle? Hydrogen is also an element; The "atomic number" of an element. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. When atoms and molecules lose or gain electrons, they form ions.

The "atomic number" of an element. Therefore, the composition and size of the particle can vary depending on the situation. There are sub atomic particles in an atom. The "atomic number" of an element. Can you differentiate between atom, molecule & particle?.. When atoms and molecules lose or gain electrons, they form ions.

Eg ch 4) and molecules of elements (eg o 2). Hydrogen is also an element; There are sub atomic particles in an atom. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… A molecule is made up of atoms, and they can be considered as particles. Therefore, the composition and size of the particle can vary depending on the situation.. Jan 08, 2012 · for example, we consider molecules as particles at some point.

Therefore, the composition and size of the particle can vary depending on the situation.. An ion is an electrically charged particle, formed when an atom or a molecule. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. When atoms and molecules lose or gain electrons, they form ions. Molecules are made up of groups of atoms. Can you differentiate between atom, molecule & particle? Jan 08, 2012 · for example, we consider molecules as particles at some point. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound.

Molecules are made up of groups of atoms.. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. There are sub atomic particles in an atom. The "atomic number" of an element. Therefore, the composition and size of the particle can vary depending on the situation. Jan 08, 2012 · for example, we consider molecules as particles at some point.

A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Hydrogen is also an element;

Can you differentiate between atom, molecule & particle? .. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…

Can you differentiate between atom, molecule & particle? There are sub atomic particles in an atom. One sub atomic particle can also be divided into more particles. The "atomic number" of an element.

I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.. The "atomic number" of an element. An ion is an electrically charged particle, formed when an atom or a molecule. Jan 08, 2012 · for example, we consider molecules as particles at some point. Molecules are made up of groups of atoms. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Can you differentiate between atom, molecule & particle? A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Hydrogen is also an element; There are sub atomic particles in an atom.

A molecule is made up of atoms, and they can be considered as particles. .. When atoms and molecules lose or gain electrons, they form ions.

There are sub atomic particles in an atom.. A molecule is made up of atoms, and they can be considered as particles. Jan 08, 2012 · for example, we consider molecules as particles at some point. Therefore, the composition and size of the particle can vary depending on the situation. One sub atomic particle can also be divided into more particles. Can you differentiate between atom, molecule & particle? Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. When atoms and molecules lose or gain electrons, they form ions. The "atomic number" of an element. An ion is an electrically charged particle, formed when an atom or a molecule. One sub atomic particle can also be divided into more particles.

Therefore, the composition and size of the particle can vary depending on the situation... Jan 08, 2012 · for example, we consider molecules as particles at some point. Can you differentiate between atom, molecule & particle? Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Eg ch 4) and molecules of elements (eg o 2). The "atomic number" of an element. When atoms and molecules lose or gain electrons, they form ions. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Therefore, the composition and size of the particle can vary depending on the situation. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…

I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. When atoms and molecules lose or gain electrons, they form ions. A molecule is made up of atoms, and they can be considered as particles. Molecules are made up of groups of atoms. The "atomic number" of an element. Therefore, the composition and size of the particle can vary depending on the situation.

Eg ch 4) and molecules of elements (eg o 2).. Molecules are made up of groups of atoms... Therefore, the composition and size of the particle can vary depending on the situation.

A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter... I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.

Molecules are made up of groups of atoms... An ion is an electrically charged particle, formed when an atom or a molecule. The "atomic number" of an element. Therefore, the composition and size of the particle can vary depending on the situation. There are sub atomic particles in an atom. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Eg ch 4) and molecules of elements (eg o 2). Molecules are made up of groups of atoms... Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound.

Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. When atoms and molecules lose or gain electrons, they form ions. Therefore, the composition and size of the particle can vary depending on the situation. The "atomic number" of an element. Can you differentiate between atom, molecule & particle? An ion is an electrically charged particle, formed when an atom or a molecule. Jan 08, 2012 · for example, we consider molecules as particles at some point.. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.

One sub atomic particle can also be divided into more particles. Hydrogen is also an element; Jan 08, 2012 · for example, we consider molecules as particles at some point. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… There are sub atomic particles in an atom. The "atomic number" of an element. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Can you differentiate between atom, molecule & particle?.. An ion is an electrically charged particle, formed when an atom or a molecule.

Molecules are made up of groups of atoms.. Molecules are made up of groups of atoms. One sub atomic particle can also be divided into more particles. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Therefore, the composition and size of the particle can vary depending on the situation. When atoms and molecules lose or gain electrons, they form ions.

One sub atomic particle can also be divided into more particles. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Can you differentiate between atom, molecule & particle? Hydrogen is also an element; Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. One sub atomic particle can also be divided into more particles. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. The "atomic number" of an element... Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter.

Therefore, the composition and size of the particle can vary depending on the situation.. One sub atomic particle can also be divided into more particles. The "atomic number" of an element. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Hydrogen is also an element; I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them... Can you differentiate between atom, molecule & particle?

When atoms and molecules lose or gain electrons, they form ions... One sub atomic particle can also be divided into more particles. Eg ch 4) and molecules of elements (eg o 2). A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Hydrogen is also an element; There are sub atomic particles in an atom.. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound.

When atoms and molecules lose or gain electrons, they form ions.. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Jan 08, 2012 · for example, we consider molecules as particles at some point. Can you differentiate between atom, molecule & particle? One sub atomic particle can also be divided into more particles. Molecules are made up of groups of atoms. When atoms and molecules lose or gain electrons, they form ions. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Jan 08, 2012 · for example, we consider molecules as particles at some point.

Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Can you differentiate between atom, molecule & particle? There are sub atomic particles in an atom. The "atomic number" of an element. One sub atomic particle can also be divided into more particles. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. Therefore, the composition and size of the particle can vary depending on the situation. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. Jan 08, 2012 · for example, we consider molecules as particles at some point.. Hydrogen is also an element;

When atoms and molecules lose or gain electrons, they form ions... Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. There are sub atomic particles in an atom. Molecules are made up of groups of atoms. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…. Jan 08, 2012 · for example, we consider molecules as particles at some point.

One sub atomic particle can also be divided into more particles.. Jan 08, 2012 · for example, we consider molecules as particles at some point. Therefore, the composition and size of the particle can vary depending on the situation. Eg ch 4) and molecules of elements (eg o 2). When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Hydrogen is also an element; Molecules are made up of groups of atoms. When atoms and molecules lose or gain electrons, they form ions. Can you differentiate between atom, molecule & particle? I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.

The "atomic number" of an element. There are sub atomic particles in an atom. Therefore, the composition and size of the particle can vary depending on the situation... I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.

One sub atomic particle can also be divided into more particles... Eg ch 4) and molecules of elements (eg o 2). The "atomic number" of an element. Hydrogen is also an element; I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Jan 08, 2012 · for example, we consider molecules as particles at some point. There are sub atomic particles in an atom. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. A molecule is made up of atoms, and they can be considered as particles.. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.

Hydrogen is also an element;. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Jan 08, 2012 · for example, we consider molecules as particles at some point. There are sub atomic particles in an atom.

There are sub atomic particles in an atom... A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. A molecule is made up of atoms, and they can be considered as particles.

When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. There are sub atomic particles in an atom. One sub atomic particle can also be divided into more particles. Can you differentiate between atom, molecule & particle? Eg ch 4) and molecules of elements (eg o 2). A molecule is made up of atoms, and they can be considered as particles.

Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound.. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. Eg ch 4) and molecules of elements (eg o 2). When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… One sub atomic particle can also be divided into more particles. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound.

One sub atomic particle can also be divided into more particles... . Eg ch 4) and molecules of elements (eg o 2).

There are sub atomic particles in an atom... Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Hydrogen is also an element; Can you differentiate between atom, molecule & particle?

Therefore, the composition and size of the particle can vary depending on the situation. Molecules are made up of groups of atoms. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. Hydrogen is also an element; There are sub atomic particles in an atom. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. A molecule is made up of atoms, and they can be considered as particles. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Eg ch 4) and molecules of elements (eg o 2). Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter.

Jan 08, 2012 · for example, we consider molecules as particles at some point. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. A molecule is made up of atoms, and they can be considered as particles. Hydrogen is also an element;. A molecule is made up of atoms, and they can be considered as particles.

There are sub atomic particles in an atom... Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. A molecule is made up of atoms, and they can be considered as particles. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. There are sub atomic particles in an atom. The "atomic number" of an element. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Jan 08, 2012 · for example, we consider molecules as particles at some point. Eg ch 4) and molecules of elements (eg o 2). Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound.. Hydrogen is also an element;

When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of….. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. The "atomic number" of an element. An ion is an electrically charged particle, formed when an atom or a molecule. Therefore, the composition and size of the particle can vary depending on the situation. A molecule is made up of atoms, and they can be considered as particles.

When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of….. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. Eg ch 4) and molecules of elements (eg o 2). There are sub atomic particles in an atom. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… An ion is an electrically charged particle, formed when an atom or a molecule. When atoms and molecules lose or gain electrons, they form ions... There are sub atomic particles in an atom.

Can you differentiate between atom, molecule & particle? A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. The "atomic number" of an element. Eg ch 4) and molecules of elements (eg o 2). There are sub atomic particles in an atom.

Therefore, the composition and size of the particle can vary depending on the situation... Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. A molecule is defined as the smallest unit of a compound that contains the chemical properties of the compound. One sub atomic particle can also be divided into more particles. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of… Molecules are made up of groups of atoms.. When atoms and molecules lose or gain electrons, they form ions.

Can you differentiate between atom, molecule & particle? Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. Jan 08, 2012 · for example, we consider molecules as particles at some point. One sub atomic particle can also be divided into more particles. Eg ch 4) and molecules of elements (eg o 2).. Jan 08, 2012 · for example, we consider molecules as particles at some point.

Jan 08, 2012 · for example, we consider molecules as particles at some point... Can you differentiate between atom, molecule & particle? Molecules are made up of groups of atoms. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. An ion is an electrically charged particle, formed when an atom or a molecule. Jan 08, 2012 · for example, we consider molecules as particles at some point.. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.

One sub atomic particle can also be divided into more particles. A molecule is made up of atoms, and they can be considered as particles. Two hydrogen atoms and one oxygen atom combine to form a molecule of water, which is a compound. Can you differentiate between atom, molecule & particle? When atoms and molecules lose or gain electrons, they form ions. Molecules are made up of groups of atoms.. When we say avogadro's number states that there are 6 x 10^23 particles for 1 mole of…

Molecules are made up of groups of atoms. Therefore, the composition and size of the particle can vary depending on the situation. Sep 17, 2016 · using the terms atoms, molecules, and particles to describe samples of matter. I received an enquiry from a subscriber to simplechemconcepts.com yesterday and i realized that many students have misconception of the different definitions given to them.. Eg ch 4) and molecules of elements (eg o 2).