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

S< Se < Ca < Ba < Ar

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Ba < Ca < Se < S < Ar

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Ca < Ba < S < Se < Ar

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Ca < S < Ba < Se < Ar

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Solution

The correct option is B
Ba < Ca < Se < S < Ar

Ionisation energy increases along a period from left to right and decreases down a group. The position of given elements in the periodic table is as
$\begin{matrix} G r o u p N o . 2 & 16 & 18 C a & S & A r B a & S e \end{matrix}$
Thus, the order of increasing $Δ H_{I E_{1}}$ is
Ba < Ca < Se < S < Ar

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Similar questions

Which of the following represent the correct order of decreasing $I E_{1}$ for Ca, Ba, S, Se and Ar?

I E_{1}

C a, B a, S, S e

A r

C a, B a, S, S e

A r

Which of the following represent the correct order of increasing $I E_{1}$ for Ca, Ba, S, Se and Ar?

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