Compounds Ionic Compounds with Covalent (Cation–Anion) hydrogen (Two Nonmetals) H–metal H–nonmetal H–oxyanion Rule: Rule 1: Rule 1: Rule: Name of cation + name of anion (without the presence of H 2 O) (without the presence a) Less electronegative (word ion dropped) hydrogen _____ide of H 2 O) element first.