Question

In the following, the element with the highest ionisation energy is

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

Answer 1

Answer: (B)

Elements having half-filled or fully filled orbitals are more stable. Hence, much energy is required to remove an electron from the outermost orbit.
So, the element with [Ne] $3 s^{2} 3 p^{3}$ configuration has highest ionisation energy.