Answer:
binary compounds have 2 different elements, and ternary compounds have 3 
Nickel(III)oxide: binary, Ni2O3 
Copper (II)iodide: binary, CuI2 
Tin(IV) nitride: binary, Sn3N4 
Chromium (II)bromide: binary, CrBr2 
Iron(III)phosphide: binary, FeP
Step-by-step explanation: