A sudden jump between the values of second and third ionization e…

MCQ

A sudden jump between the values of second and third ionization energies of an atom would be associated with the electronic configuration:

A
$ 1 s^2, 2 s^2, 2 p^6 $
B
$ 1 s^2, 2 s^2, 2 p^6, 3 s^2, 3 p^1 $
C
$ 1 s^2, 2 s^2, 2 p^6, 3 s^2, 3 p^2 $
✓
$1 s^2, 2 s^2, 2 p^6, 3 s^2 $

✓

Answer

Correct option: D.

$1 s^2, 2 s^2, 2 p^6, 3 s^2 $

Magnesium $1 s^2, 2 s^2, 2 p^6, 3 s^2 $ is in group $2$ of the Periodic Table and has first ionisation energy $737.7\ \text{kJ/mol}$, second ionisation energy $1450.7\ \text{kJ/mol}$ and third ionisation energy $7732.7\ \text{kJ/mol.}$
Here the big jump occurs after the second ionisation energy. It means that there are $2$ electrons which are relatively easy to remove the $3s^2$ electrons, while the third one is much more difficult because it comes from an inner level $-$ closer to the nucleus and with less screening.

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