Question
The second ionization energy is maximum for
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Answer
a
The ionization energy increases for atoms or ions which already has a stable electronic configuration.
The ionization energy increases for atoms or ions which already has a stable electronic configuration.
The electronic configuration of
$B ^{+} \rightarrow \,1 s ^2 \,2 s ^2$
$Be ^{+} \rightarrow \,1 s ^2\, 2 s ^1$
$Mg ^{+} \rightarrow \,1 s ^2\, 2 s ^2\, 2 p ^6\, 3 s ^1$
$Si ^{+} \rightarrow \,1 s ^2 \,2 s ^2 \,2 p ^6 \,3 s ^2 \,3 p ^1$
So, in $B ^{+}$the electron is to be removed from completely filled $s$-subshell, which is difficult. Thus, the second ionization energy of boron is maximum.
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