well first off S-2 is a monoatomic anion
Ca2+ and S2-
It has a charge of 2-, S2-
Ammonium sulfide is soluble in water.
S2-
The symbol for sulfide, one of the many ions, is S2-.
It is called the Sulphide ion
Barium Oxide is BaO.Ba+2 is Barium positive ion (anion).
S2-
The ion is S2-.
Sulfur can form the sulfide ion (S2-) and the disulfide ion (S22-) on its own. When combined with oxygen it can form the sulfate ion (SO42-) and sulfite ion (SO32-).
The Sulfide ion, S2-, is isoelectronic with Cl-
S2- ion: [Ne]3s23p6