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Question

Which of the following represent the correct order of increasing IE1 for Ca, Ba, S, Se and Ar?


A

S < Se < Ca < Ba < Ar

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B

Ba < Ca < Se < S < Ar

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C

Ca < Ba < S < Se < Ar

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D

Ca < S < Ba < Se < Ar

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Solution

The correct option is B

Ba < Ca < Se < S < Ar


IE1 increases along the period and decreases down the group. Ar has completely filled electrons (stable structure) hence highest IE1
Ar >S >Se > Ca >Ba
18th group 16th group 16thgroup II group II group
III period III period IV period IV period VI period


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