Which of the following has maximum ionisation potential?

Question

Which of the following has maximum ionisation potential? (A) Na (B) K (C) Be (D) Mg

Tardigrade Admin · Accepted Answer

Alkali metals have lower ionisation potential than alkaline earth metals due to the extra nuclear charge in alkaline earth metals (which pulls e inwards). Also, Mg has got lower ionisation potential than Be as electron to be removed from Mg is present in one. shell outwards than in Be.

Q. Which of the following has maximum ionisation potential?

Na

K

Be

Mg

Alkali metals have lower ionisation potential than alkaline earth metals due to the extra nuclear charge in alkaline earth metals (which pulls e inwards). Also, $M g$ has got lower ionisation potential than $B e$ as electron to be removed from $M g$ is present in one. shell outwards than in Be.