Which of the following represents the correct order of increasing first ionization enthalpy for $Ca, B a, S, S e$ and $Ar ?$

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$Ca < S < B a < S e < A r$

$S < S e < C a < B a < A r$

$Ba < C a < S e < S < A r$

$Ca < B a < S < S e < A r$

answer is C.

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Detailed Solution

Order of increasing $Δ_{i} H_{1} : B a < C a < S e < S < A r B a < C a; S e < S .$ On moving top to bottom in a group, size increases, therefore, ionization enthalpy decreases.
Ar has maximum value of ionization enthalpy, since it is inert gas.

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