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(B) The second ionisation energy is the energy required to remove an electron from a unipositive ion.For option $B$ $(1s^2\,2s^2\,2p^6\,3s^1)$,the fir

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$1s^2\,2s^2\,2p^6\,3s^1$

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(B) The second ionisation energy is the energy required to remove an electron from a unipositive ion.For option $B$ $(1s^2\,2s^2\,2p^6\,3s^1)$,the first ionisation removes the $3s^1$ electron to form a $Na^+$ ion with configuration $1s^2\,2s^2\,2p^6$.The second ionisation involves removing an electron from this $2p^6$ configuration,which is the stable noble gas configuration of $Ne$.Removing an electron from a stable octet requires a very high amount of energy compared to the other options.

From the ground state electronic configuration of the elements given below,pick the one with the highest value of second ionisation energy.

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