What does the following denote 2N , N2 , 2N2 , N.

1. 2N denotes two nitrogen atoms.
2. N2 denotes one molecule nitrogen gas.
3. 2N2 denotes 2 molecules of nitrogen gas
4. N denotes one 1 atom of element nitrogen. 

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Please answer... i have my SA - 2 on 13th....

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