Question

Which of the following has maximum ionization energy
(a) $Ba \longrightarrow Ba^+ + e^-$
(b) $Be \longrightarrow Be^+ + e^-$
(c) $Ca \longrightarrow Ca^{2+} + 2e^-$
(d) $Mg \longrightarrow Mg^{2+} + 2e^-$

Answer 1

(d) Sum of 1st and 2nd ionization energy of Mg is higher than other mentioned process.