Define the term atomicity. Differentiate between monoatomic molecule and diatomic molecule with few examples.
[3 Marks]

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Solution

The number of atoms constituting a molecule is known as atomicity.
[1 Mark]

Monoatomic molecule Diatomic molecule

A molecule which contains only one atom.
[0.5 Marks] A molecule which contains two atoms.
[0.5 Marks]

Example: Helium (He), neon (Ne), etc.
[0.5 Marks] Example: Hydrogen ( $H_{2}$ ), nitrogen ( $N_{2}$ ), etc.
[0.5 Marks]

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Monoatomic molecule	Diatomic molecule
A molecule which contains only one atom. [0.5 Marks]	A molecule which contains two atoms. [0.5 Marks]
Example: Helium (He), neon (Ne), etc. [0.5 Marks]	Example: Hydrogen ( $H_{2}$ ), nitrogen ( $N_{2}$ ), etc. [0.5 Marks]