Chemistry help- effective nuclear charge

Question

In terms of size, between which of the spheres would you find the Ca2+ and S2- ions?

note:not all targets will be used

Mg2+, K+, Cl-, Se2-

Answer 1

Ca²⁺ would be smaller than K⁺ and larger than Mg²⁺

S^2- would be smaller than Se^2- and larger than Mg²⁺