Question

The configuration $1s^{2}2s^{2}2p^{5}3s^1$ shows :

• A. excited state of $O_2^{-}$
• B. excited state of neon atom
• C. excited state of fluorine atom
• D. ground state of fluorine atom

Answer 1

The correct option is B excited state of neon atom

Atomic number of the given element $=10$
Electronic configuration $=1s^2,2s^2{p}^6$
$1s^{2}2s^{2}2p^6$ is electronic configuration of Ne.
$1s^{2}2s^{2}2p^{5}3s^1$ is excited oxidation state.