Question

Amongst the elements with following electronic configurations, which one may have the highest ionisation energy?

• A. \([\text{Ne}]\,3s^2 3p^2\)
• B. \([\text{Ar}]\,3d^{10}4s^2 4p^3\)
• C. \([\text{Ne}]\,3s^2 3p^1\)
• D. [Ne]3s² 3p³

Hint:

Half-filled and fully-filled subshells are especially stable.

Answer 1

The Correct Option is D

Step 1: Half-filled p³ configuration is extra stable.
Step 2: Greater stability implies higher ionisation energy.