Q.

Which of the following represents the electronic configuration of the most electropositive element?

Moderate

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a

[He]2s1

b

[Xe]6s1

c

[He]2s2

d

[Xe]6s2

answer is B.

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Detailed Solution

Group I elements with ns1 configuration are more electropositive (EP) than group 2 (ns2) configuration. Moreover EP character increases down the group 1 (↓).So, Cs (6s1) is the most EP element.
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