The ion is S2-.
The chemical formula for aluminum sulfide is Al2S3.
The chemical formula for hydrogen sulfide is H2S.
The sulfide anion is S2-
The chemical symbol for Potassium Sulphate is K2SO4
The chemical symbol for sulfide is S²-.
The chemical symbol for hydrogen sulfide is H2S.
Sodium sulfide
Mg2+S2-
The chemical formula (not symbol) of sodium sulfide is Na2S.
The chemical formula for hydrogen sulphide is H2S. (Compounds have chemical formulas; only chemical elements have chemical symbols.)
The chemical formula of calcium sulfide is CaS; the ions are Ca2+ and S2-.
Ni is the symbol for Nickel.