Question

write anion and cation in magnesium oxide, copper sulphate ,ammonium chloride.​

Answer 1

Positively charged ions are called cation and Negatively charged ions are called anion.

Mg is a cation Mg^+2

CuSO4 -- Cu^+2 and SO4^-2

NH4Cl -- NH4^+1 and Cl^-1

I think so it is the answer