Of the four compounds listed below, which are molecular compounds? How can you tell? PBr3; KBr; iron(III) oxide; carbon tetraiodide
A KBr and iron(III) oxide, because each contains a metal and a nonmetal
B PBr3 and KBr, because they contain only two elements
с PBr3 and carbon tetraiodide, because they contain nonmetals only
D All four compounds are molecular, because they contain only two elements