Question

Which electronic configuration of neutral atom will have the highest first ionization potential ?

• A. $1s^2,2s^{2}2p^1$
• B. $1s^2,2s^{2}2p^3$
• C. $1s^2,2s^{2}2p^2$
• D. $1s^2,2s^{2}2p^4$

Answer 1

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

In the case of removing an electron from the p orbital, a fully filled configuration ($p^6$) or a half-filled configuration ($p^3$ ) will require more ionization potential. Removal of an electron from $2p$ half-filled is more difficult.

Hence, option B is the correct answer.