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Question

What do the following denote ?
(i) N
(ii) 2N
(iii) N2
(iv) 2N2

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Solution

(i) N refers to an atom of nitrogen.
(ii) 2N represents two atoms of nitrogen which are not chemically bonded.
(iii) N2 refers to a molecule of nitrogen gas. Two atoms of nitrogen chemically bond to give a molecule of nitrogen gas.
(iv)2N2 refers to two molecules of nitrogen gas.

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