The polyatomic ion SO4 2- is known as sulfate.
Sulfate consists of one sulfur (S) atom bonded to four oxygen (O) atoms. The sulfur atom at the center has a +6 oxidation state, and the four oxygen atoms are arranged around it. This structure is important in various chemical reactions and is commonly found in many salts and minerals. Sulfate plays a critical role in biological systems and is also a significant component in industrial processes, including the production of fertilizers and the manufacturing of chemicals.