Which of the compounds Li3N NH3 C3H8 IF3 are ionic?

Li3N and IF3 are ionic compounds, while NH3 and C3H8 are covalent compounds. Li3N contains a metal (Li) and a nonmetal (N), forming an ionic bond, and IF3 has a metal (I) and a nonmetal (F) as well. NH3 (ammonia) and C3H8 (propane) consist only of nonmetals, forming covalent bonds.