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The lowest ionisation energy possessed the following elements :

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{1s}^{2} {2s}^{2} {2p}^{6} {3s}^{1}

{1s}^{2} {2s}^{2} {2p}^{5}

{1s}^{2} {2s}^{2} {2p}^{6}

{1s}^{2}

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detailed solution

Correct option is A

$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1} = 11 = Na$

Metals have low ionization energy.

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