Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

A
$Ca < S < Ba < Se < Ar$
B
$S < Se < Ca < Ba < Ar$
C
$Ba < Ca < Se < S < Ar$
D
$Ca < Ba < S < Se < Ar$

Solution:

The electronic configurations of the given elements are

$_{20} Ca (4 s^{2}),_{56} Ba (6 s^{2}),_{16} S (3 s^{2} 3 p^{4}),_{32} Se (4 s^{2} 4 p^{4})$ and $_{18} Ar (3 r^{2} 3 p^{6})$

The increasing order of first ionization enthalphy will be

$Ba < Ca < Se < S < Ar$

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