I can't find any reference to Beryllium Sulphide - Beryllium sulfate is BeSO4
The formula for cesium sulphide is Cs2S.
The formula for lithium sulphide is Li2S.
The formula for Lead Sulfide (or Lead Sulphide) is either: PbS for Lead(II) Sulphide, or PbS2 for Lead(IV) Sulphide.
The chemical formula of caesium sulphide is Cs2S.
The formula is: Li2S the "2" is a subscript
Formula: CaS
It is SrS
AlS
It is As2S3
It is Na2S
SO2
Cu2S