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