This chemistry document lists common cations and anions and their compounds. It shows calcium sulfate (CaSO4) and calcium arsenate (Ca3(AsO4)2) as examples of compounds formed from the calcium cation (Ca2+) with the sulfate (SO42-) and arsenate (AsO4 3-) anions. Silver sulfate (Ag2SO4) and silver arsenate (Ag3AsO4) are also listed as compounds formed from the silver cation (Ag+) with the sulfate and arsenate anions.