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Question

Explain monatomic, diatomic, and triatomic molecules.

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Solution

The number of atoms constituting a molecule is known as its atomicity.
Depending upon the number of atoms, molecules can be:

Monatomic- A molecule which contains only one atom. Example: Helium, neon, etc.

Diatomic- A molecule which contains two atoms. Example: Hydrogen molecule, nitrogen molecule, etc.

Triatomic- A molecule which contains three atoms. Example: Carbon dioxide, water, etc.

Molecules containing more than 3 atoms are considered as polyatomic molecules.

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