Answer:
phosphorus sulfide should be P2S3
Explanation:
Phosphorus can't exists as an atom itself, it needs to be like oxygen, so it must have 2 atoms covalently bonded to each others, making it P2. Sulfide itself is sulphur bonded in a 3 way exchange. Sulphate is the 2 way exchange, so S3 would be attached to phosphorus, making it P2S3
