Atomicity refers to the number of atoms that constitute a molecule. For example, the atomicity of oxygen gas (O2) is 2, while that of ozone (O3) is 3.
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Oxygen (O2) exists as a diatomic molecule, meaning it consists of two atoms of oxygen bonded together.
Helium (He) is an example of an element whose molecules consist of only one atom.
Molecules are composed of atoms of the same or different elements bonded together chemically.
Water (H2O) is an example of a molecule composed of two hydrogen atoms bonded to one oxygen atom. The atoms are held together by covalent bonds, resulting in a polar molecule with unique properties such as surface tension, high specific ...