Question

How many single bonds can nitrogen form?

Answer 1

Up to 4 in a quaternary ammonium salt, `R_4N^+`.

Explanation:

I could even quote the acid base reaction of ammonia, where ammonia becomes quaternized to give ammonium ion:

`H_3N + H_2O rarr H_4N^(+) + HO^-`.

Each `N-H` bond is equivalent, even though the nitrogen centre is formally cationic.