Question

What is the salt formed when Copper (II) combined with Sulfur (S) and how do you write the formula?

Answer 1

Copper(II) sulfide.

Explanation:

This is copper and sulfur reacting to form copper(II) sulfide.

Copper forms an ion with `2+` charge. Sulfur forms an ion with `2-` charge, so the formula of copper(II) sulfide is `"CuS"` as the charges simply cancel out.