Question

the name for cus is
a copper sulfite
b copper (ii) sulfide
c copper sulfide
d copper (i) sulfide

Explanation:

Sulfide ion ($S^{2 -}$) has a - 2 charge. Copper can have +1 or +2 oxidation states. To balance the - 2 charge of sulfide, copper has a +2 oxidation state in CuS. In naming ionic compounds with transition metals, the oxidation state of the metal is indicated by Roman numerals in parentheses. So CuS is named copper (II) sulfide.

Answer:

B. copper (II) sulfide