A sudden large jump between the values of second and third ionisation energies of an element would be associated with the electronic configuration

Options

A. `1s^(2)2s^(2)2p^(6),3s^(1)3p^(2)`
B. `1s^(2),2s^(2)2p^(6),3s^(2)3p^(1)`
C. `1s^(2),2s^(2)2p^(6),3s^(1)`
D. `1s^(2),2s^(2)2p^(6),3s^(2)`

Answer

D

Explanation

A sudden large jump between the value of `2^(nd)` and `3^(rd)` ionisation energies of an element indicates,that the element has two electrons in its valence shell.Then,the possible electronic configuration may be`1s^(2),2s^(2),2p^(6),3s^(2)`