Q. Which of the following electronic configurations in the outermost shell is characteristic of alkali metals?
A) $ns^{2}p^{6}d^{1}$
B) $(n - 1)s^{2}p^{6},\ ns^{1}$
C) $(n - 1)s^{2}p^{6},\ ns^{2}p^{1}$
D) $(n - 1)s^{2}p^{6}d^{10},\ ns^{1}$
Explanation
The correct answer is Option B: $(n - 1)s^{2}p^{6},\ ns^{1}$.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.