Scandium's typical oxidation state is +3
Phosphate (PO4) is -3 charge so the formula is:
ScPO4
Sc2(CO3)3
Scandium carbonate, Sc2(CO3)3. x H2O; molecular mass is 296,96.
The chemical formula for scandium (III) and phosphate ion is ScPO4.
It is ScI3.
Sc2Se3
ScI3
Scandium carbonate, Sc2(CO3)3. x H2O; molecular mass is 296,96.
The chemical formula for scandium (III) and phosphate ion is ScPO4.
Formula: ScCl3
Sc2O3
It is ScI3.
Assuming it's scandium(III), which is its most common valence state, the formula would be Sc2Se3.
ScI3
Sc2Se3
Scandium sulphide (or discandium trisulphide): Sc2S3
Scandium has the chemical symbol Sc and 21 is it's atomic number. A link is provided to the Wikipedia article on this (usually considered) rare earth element.
The formula for silver carbonate is Ag2CO3
Sc2N3(Sc for scandium and N for nitrogen)