Which of the following represent the correct order of increasing $I E_{1}$ for Ca, Ba, S, Se and Ar?
(JEE Advanced, 2013)

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
$I E_{1}$ increases along the period and decreases sown the group. Moreover Ar is inert gas, has completely filled $¯, e s$ (Stable structure)

Hence highest $I E_{1} .$

Ar >
(18 gp, 3rd
period) S >
(16 gp, 3rd
period) Se >
(16 gp, 4th
period Ca >
(2nd gp, 4th
period) Ba
(2nd gp, 6th
period)

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