Question

For the following set of atoms and ions, arrange the members in order of decreasing size?

a) K⁺, Ca²⁺, Ga³⁺

b) Ca²⁺, Be²⁺, Mg²⁺

c) Al³⁺, Sr²⁺, Rb⁺, Na⁺

d) K⁺, Ca²⁺, Rb⁺