Arrange the molecules according to the decreasing order of their number of atoms.

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Solution

Water ( $H_{2}$ $O$ ) is a triatomic molecule containing 2 H and 1 O atom.

Methane ( ${CH}_{4})$ is a polyatomic molecule containing 4 H and 1 C atom.

Bromine ( ${Br}_{2})$ is a diatomic molecule containing 2 Br atoms.

Neon (Ne) exists as a single atom. Hence, it is a monoatomic molecule.

Arranging the molecules according to their atomicity:
Methane (molecule with 5 atoms) > Water (molecule with 3 atoms) > Bromine (molecule with 2 atoms) > Neon (molecule with 1 atom).

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According to Mendeleev’s periodic law, the elements were arranged in the periodic table in the order of :

(a) decreasing atomic numbers (b) increasing atomic numbers

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