A) The first ionisation potential of \[Al\] is less than the first ionisation potential of \[Mg\]
B) The second ionisation potential of \[Mg\] is greater than the second ionisation potential of \[Na\]
C) The first ionisation potential of \[Na\] is less than the first ionisation potential of \[Mg\]
D) The third ionisation potential of \[Mg\] is greater than the third ionisation potential of \[Al\]
Correct Answer: B
Solution :
I.E.(II) of \[Na\] is higher than that of \[Mg\] because in case of \[Na\], the second \[{{e}^{-}}\] has to be remove from the noble gas core while in case of \[Mg\] removal of second \[{{e}^{-}}\] gives a noble gas core. \[Mg\] has high first ionisation potential than \[Na\] because of its stable \[n{{s}^{2}}\] configuration.
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