How do you find the chemical formula of Copper (II) Sulfate?

Copper(II) sulfate is an ionic compound which contains copper(II) and sulfate ions.

The formula of copper(II) and sulfate ions are Cu²⁺ and SO₄²⁻ respectively.

Each Cu²⁺ ion carries 2 positive charges, while each SO₄²⁻ ion carries 2 negative charges. As copper(II) sulfate is a neutral compound, the ratio in number of Cu²⁺ to SO₄²⁻ should be 1 to 1. Hence, the chemical formula of copper(II) sulfate is CuSO₄.

You know that "sulfate" is SO4 and has a charge of -2.
You know that Copper (II) is Cu and has a charge of +2.
So if you have one of each, their charge balances out. CuSO4.

periodic table