In which of the following,elements are correc | vedclass

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(A) The second ionisation enthalpy involves the removal of an electron from the $M^+$ ion. The electronic configurations of the ions after the first i

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$O > F > N > C$

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(A) The second ionisation enthalpy involves the removal of an electron from the $M^+$ ion. The electronic configurations of the ions after the first ionisation are:$F^+: 1s^2 2s^2 2p^4$$O^+: 1s^2 2s^2 2p^3$$N^+: 1s^2 2s^2 2p^2$$C^+: 1s^2 2s^2 2p^1$$O^+$ has a stable half-filled $2p^3$ configuration,which makes the removal of the second electron more difficult compared to $F^+$. Thus,the second ionisation enthalpy of $O$ is higher than that of $F$. The overall decreasing order is $O > F > N > C$.

In which of the following,elements are correctly arranged in the decreasing order of their second ionisation enthalpies?

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