Identify the non metal in these compounds mgo nah albr3 and fes

Among the elements, there are only a few nonmetal elements compared to the metal elements. Nonmetals include the noble gases - radon, helium, argon, neon, xenon, and krypton. Other nonmetals are carbon, hydrogen, oxygen, nitrogen, phosphorus, fluorine, argon, sulfur, chlorine, iodine, bromine, selenium, and astatine. Thus, the nonmetals in the listed compounds are:

MgO - O (oxygen)
NaH - H (hydrogen)
AlBr₃ - Br (bromine)
FeS - S (sulfur)