Use the iupac nomenclature rules to give the name for this compound - ca2s3.

According to IUPAC nomenclature the cation is named first followed by name of anion

in the given compound the cation is calcium  (Ca^+2)

The anion is sulphide (S^-2)

So the name of the given compound will be Calcium shulphide

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer