Chapter 5, Problem 39P

Without consulting any tables, arrange the following substances in order and explain your choice of order:

(a) ${\text{Mg}}^{\text{2}+},\text{Ar},{\text{Br}}^{-},{\text{Ca}}^{\text{2}+}$ in order of increasing radius

(b) Na, ${\text{Na}}^{\text{+}}$ , O, Ne in order of increasing ionization energy

(c) H, F, Al, O in order of increasing electronegativity