Chapter : 3. Atoms & Molecules
Atomicity
Atomicity The number of atoms present in one molecule of an element is called its atomicity.
Example. Noble gases (helium, neon, argon, krypton, etc.) have one atom each in their molecules such as He, Ne, Ar and Kr. So, the atomicity of noble gases is 1.
Example. Hydrogen (H
2), nitrogen (N
2), oxygen (O
2), chlorine (Cl
2), bromine (Br
2), and iodine (I
2), all have 2 atoms each in their molecules. So, the atomicity of hydrogen, nitrogen, oxygen, chlorine, bromine and iodine is 2 each.
Atomicity of some common elements. | Type of Element | Name | Symbol | Atomicity |
| Non-metal | Helium | He | Monoatomic |
| | Argon | Ar | Monoatomic |
| | Neon | Ne | Monoatomic |
| | Hydrogen | H2 | Diatomic |
| | Chlorine | Cl2 | Diatomic |
| | Nitrogen | N2 | Diatomic |
| | Oxygen | O2 | Diatomic |
| | Phosphorus | P4 | Tetratomic |
| | Sulphur | S8 | Polyatomic |
| Metals | Sodium | Na | Monoatomic |
| | Iron | Fe | Monoatomic |
| | Aluminium | Al | Monoatomic |
| | Copper | Cu | Monoatomic |
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