$(i)$ $Ba < Sr < Ca$ $(ii)$ $S^{-2} < S < S^{2+}$ $(iii)$ $C < O < N$ $(iv)$ $Mg < Al < Si$
$M(s) \to M(g)\,\,\,\,\,\,\,\,\,\,\,\,\,\, ........(1)$
$M(s) \to M^{2+} (g) + 2e^-\,\,\,\,\,\,\,\,.......(2)$
$M(g) \to M^+(g) + e^-\,\,\,\,\,\,\,\,\,\,\,.........(3)$
$M^+ (g) \to M^{2+} (g) + e^-\,\,\,\,\,\,\,\,\,.........(4)$
$M(g) \to M^{2+} (g) +2e^-\,\,\,\,\,\,\,\,\,\,\,..........(5)$
$M$ની બીજી આયનીકરણ ઊર્જાની ગણતરી ક્યા ઊર્જા મૂલ્યોથી કરી શકાય છે?