What atoms combined with nitrogen?

Answer 1

Are you asking what atoms can combine with nitrogen and form bonds?

Lots: nitrogen can form bonds with other nitrogen atoms, forming N2 (which makes up 80% of the composition of the atmosphere). Nitrogen also commonly forms bonds with hydrogen (NH4 is ammonia), oxygen, carbon (CN- is cyanide). These are probably the most common ones, but Nitrogen can form bonds with many, many other atoms.

Answer 2

Nitrogen can combine with various atoms to form different compounds, such as oxygen to form nitrous oxide, hydrogen to form ammonia, carbon to form cyanide, and sulfur to form various sulfides.