How many hydrogens would be required to complete a molecule that contained a carbon and a nitrogen with a C-N single covalent bond between them?

Answer 1

Carbon = 4 valance electrons

Nitrogen = 5 valance electrons

4 + 5 = 9 and 2 valance electrons used for the single bond, 9 - 2 = 7

3 hydrogens can attach to the carbon and 4 hydrogens can attach to the nitrogen, so.......

7 hydrogen atoms would complete this molecule

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Answer 2

One hydrogen is required to complete the molecule containing a carbon and a nitrogen with a C-N single covalent bond. Carbon forms 4 bonds and nitrogen forms 3 bonds in this structure, so adding one hydrogen would satisfy the valency requirements for both carbon and nitrogen.