Sudden large jump between the values of 2nd and 3rd IP of an element would be associated with the electronic configuration :

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

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1 s^{2}, 2 s^{2} 2 p^{6}, 3 s^{2} 3 p^{5}

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

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

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Solution

The correct option is A $1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2}$
Sudden large jump between the values of 2nd and 3rd IP of an element would be associated with the electronic configuration $1 s^{2}, 2 s^{2} 2 p^{6} 3 s^{2}$ . $(I P_{2} - I P_{3})$ is large so, 2 valence $e^{-}$ are present. It is an alkaline earth metal.

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