Q. If Aufbau rule is not followed, K-19 will be placed in
A) $s$-block
B) $p$-block
C) $d$-block
D) $f$-block
Explanation
(c)
If Aufbau rule is not followed then 19^{th} electron in K enters in $3d$ sub-shell, not in $4s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.