The second ionization energy is maximum for

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(A) The ionization energy increases for atoms or ions that have a stable electronic configuration.The electronic configurations of the unipositive ion

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boron

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(A) The ionization energy increases for atoms or ions that have a stable electronic configuration.The electronic configurations of the unipositive ions are:$B^{+} \rightarrow 1s^2 2s^2$$Be^{+} \rightarrow 1s^2 2s^1$$Mg^{+} \rightarrow [Ne] 3s^1$$Al^{+} \rightarrow [Ne] 3s^2$In $B^{+}$,the electron is to be removed from a completely filled $2s$-subshell,which is highly stable and requires more energy.Thus,the second ionization energy of boron is maximum.

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