3 a. Cu⁺² and Br<sup>1-

Need to make the compound neutral by balancing positive and negative ions:
Need one copper and two bromine

CuBr</sup>₂

two non metals? no
metal/nonmetal? yes
metal with more than one charge?yes

Cu has a charge of +2 and compound is binary so -ide on end of nonmetal

copper (II) bromide