What types of atoms are in nh3 or ammonia how many hydrogen and how many nitrogen

Ammonia is NH3.

If you are calculating ratio of hydrogen by moles, the ratio is 3:1 because for every nitrogen there is 3 hydrogens.

If you are calculating percentage of hydrogen by mass, the percentage is 17.75%.

3 (1.008) / [3 (1.008) + 14.01] * 100 = 17.75%