Final answer:
The chemical name for CU3N2 is Copper (I) nitride, indicating that each copper atom has a +1 charge, which balances the charge from two nitride ions (N with a −2 charge). So the correct option is A.
Step-by-step explanation:
The chemical name for CU3N2 is Copper (I) nitride. When naming ionic compounds containing metals with multiple oxidation states, the charge on the metal cation is indicated in parentheses using Roman numerals. Since the nitrogen (N) in this formula exists as a −2 anion and there are two nitrogen atoms, this results in a total of −4. To balance this charge, we have three copper atoms, meaning each copper atom must exhibit a +1 charge to balance out the −4 charge from the nitride ions (since 3 (+1) = +3 and balances 2 (−2) = −4). Therefore, the correct nomenclature includes the oxidation state of the copper, which is (I), resulting in the answer being Copper (I) nitride.