$P b^{2 +}, N_{2}, B, P H_{3}, A g, I^{-}$

Categorise the above species into: i) atoms ii) molecules iii) ions

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Solution

(i) Atoms are electrically neutral species that make up a chemical element. In given species, $B$ and $A g$ are atoms.
(ii) Molecules are electrically neutral species formed by combination of $1$ or more atoms of same or different element. Hence, $P H_{3}$ and $N_{2}$ are molecules.
(iii) Ions are electrically charged species composed of atoms of same or different elements. In the given species, $P b^{2 +}$ and $I^{-}$ are ions.

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