Which one of the following electronic configuration corresponds to the element with maximum electopositive character?

[K r] 5 s^{1}

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[N e] 3 s^{1}

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[A r] 4 s^{1}

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[X e] 6 s^{1}

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Solution

The correct option is C $[X e] 6 s^{1}$
The electropositive character of an element increases with decreasing IE. Thus most electropositive element has lowest IE, i.e., Cs. Its configurations is $[X e] 6 s^{1}$

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