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Question

Pb2+, N2, B, PH3, Ag, 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 Ag are atoms.
(ii) Molecules are electrically neutral species formed by combination of 1 or more atoms of same or different element. Hence, PH3 and N2 are molecules.
(iii) Ions are electrically charged species composed of atoms of same or different elements. In the given species, Pb2+ and I are ions.

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