The incorrect statement Among the following is A)The first ionisation potential of Al is less than the first ionisation potential of Mg. B)The first ionisation potential of Na is less than the first ionisation potential of Mg. C)The second ionisation potential of Mg greater than the second ionisation potential of Na D)The third ionisation potential of Mg greater than the third ionisation potential of Al

Options

A. The first ionization potential of al is less than the first ionization potential of Mg
B. The second ionization potetial of Mg is greater than the second ionization potential of Na
C. The first ionization potential of Na is less than the first ionization potential of Mg
D. The third ionization potential of Mg is greater than the third ionization potential of Al.

Answer

B

Explanation

`IE_(2)` of Mg is lower than that of Na because in case of `Mg^(2+)` 3s-electron has to be removed while in case of `Na^(+)` , an electron from the stable inert gas configuration (Neon) has to be removed.