Q. Amongst the elements with following electronic configurations, which one of them may have the highest ionization energy?
A) [Ne] 3s²3p²
B) [Ar] 3d¹⁰4s²4p³
C) [Ne] 3s²3p¹
D) [Ne] 3s²3p³
Explanation
[Solution from source] [Ne]3s²3p³ is phosphorus: a small period-3 atom with a stable half-filled 3p subshell, so it has the highest ionization energy here. [Ar]3d¹⁰4s²4p³ (arsenic) is also half-filled but larger, and the 3p¹ and 3p² atoms (Al, Si) lose electrons more easily. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.