The incorrect statement among the following is

Options

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

Answer

B

Explanation

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 `ns^2` configuration.