Question

From the ground state electronic configuration of the elements given below, which has the highest value of second ionization energy?

• A. $1s^{2}2s^{2}2p^{6}3s^2$
• B. $1s^{2}2s^{2}2p^{6}3s^1$
• C. $1s^{2}2s^{2}2p^6$
• D. $1s^{2}2s^{2}2p^5$

Answer 1

The correct option is B $1s^{2}2s^{2}2p^{6}3s^1$

$1s^{2}2s^{2}2p^{6}3s^1$, the second ionisation energy will be very high for this electronic configuration as it involves removal of the electron from a configuration, $2s^{2}2p^6$ which is the stable electronic configuration of $Ne$.