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Molecules of Elements:
The molecules of an element are constituted by the same type of atoms.
For example,
Mono atomic: ( atomicity=1) All the inert gases such as Ne, He, Ar, All the metals such
as Na,K , Au etc
Diatomic: ( Atomicity=2) O 2, H 2, Cl 2, N 2, Br 2
Triatomic: ( Atomicity=3) Ozone(O 3)
Tetratomic: ( Atomicity=4) P 4
Octatomic: ( Atomicity=8) S 8
Molecules of Compounds:
Atoms of different elements join together in definite proportions to form molecules of
compounds.
For example, a molecule of water consists of two atoms of hydrogen and one atom of
oxygen to form a triatomic molecule H 2O.

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