Q. What does the electronic configuration $1s^{2},2s^{2},2p^{5},3s^{1}$ indicate?
A) Ground state of fluorine
B) Excited state of fluorine
C) Excited state of neon
D) Excited state of the $O_{2}^{-}$ ion
Explanation
(c)
The atomic number of neon is 10.
$G.S.Ne\lbrack 10\rbrack:1s^{2},2s^{2},2p^{6}$
$E.S.Ne\ \lbrack 10\rbrack:1s^{2},2s^{2},2p^{5},3s^{1}$
Hence, $1s^{2},2s^{2},2p^{5},3s^{1}$ electronic configuration indicates the excited state of neon.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.