5 e. FeCrO₄

two nonmetals? no
metal that has more than one charge? yes

calculate charge of metal with more than one charge;

CrO₄ has a charge of -2 and there is only one chromate; the total negative charge is negative 2; the total positive charge is, thus, +2 and since there is only one iron that one iron must be +2.

iron (II) chromate