Which category does the ion po43- belong to? monatomic cation monatomic anion polyatomic anion polyatomic cation monatomic ion

PO4³⁻(phosphate anion) is a polyatomic anion which first of all means that he has more then one atom in his structure. ³⁻means that he is negatively charged, so that's why he is an anion. ³⁻ also means that he has 3 extra electrons, 3 more electrons than there are protons in the nuclei of a phosphorus atom plus oxygen atoms.

Standing in the sunlight and feeling the heat on your face (uv radiation is entering the skin, converting to infrared radiation, and is absorbed by your tissues)orstanding near a fire and feeling the heat on your skin (infrared radiation transfer)