Question

What is the chemical formula of copper II sulfide?

Answer 1

Copper (II) Sulfide.
The 'II' represents the ion charge of the copper. Since copper is a metal, the atom(s) in this compound will have a charge of +2.

The 'sulfide' comes from an ionic bond with a sulfate polyatomic ion.
Sulfate is SO4, with an ion charge of -2.

c:

Answer 2

sulfide and sulfate and NOT the same ions. The polyatomic \(SO_4^{-2}\) ion is the sulfate ion. The sulfide ion is a single sulfur atom that has gained 2 electrons to fill its valence shell, and has the formula \(S^{-2}\). Copper (II) sulfide, then, is this:

\(CuS\)

NOT

\(CuSO_4\)

Answer 3

Smh, thanks Fraser.