Arrange the molecules according to their atomicity.

Neon < Ammonia < Carbon dioxide

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Ammonia < Carbon dioxide < Neon

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Carbon dioxide < Neon < Ammonia

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Neon < Carbon dioxide < Ammonia

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Solution

The correct option is D Neon < Carbon dioxide < Ammonia
Carbon dioxide ( ${CO}_{2}$ ) contains 1 C and 2 O atoms. So, its atomicity is 3 and it is a triatomic molecule.

Ammonia ( ${NH}_{3})$ contains 1 N and 3 H atoms. So, its atomicity is 4 and it is a polyatomic molecule.

Neon (Ne) exists as a single atom. So, its atomicity is 1 and it is a monoatomic molecule.

Arranging the molecules according to their atomicity:
Neon (molecule with 1 atom) < Carbon dioxide (molecule with 3 atoms) < Ammonia (molecule with 4 atoms)

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