Copper sulfate (CuSO4) is not a covalent compound. It is an ionic compound, meaning it is composed of ions held together by electrostatic forces. In copper sulfate, the copper atoms lose two electrons to become positively charged copper(II) ions (Cu2+), while the sulfate ions (SO42-) are negatively charged. The positive and negative charges of the ions attract each other, forming the ionic compound copper sulfate.