Question

The configuration $1s^2 \,2s^2\, 2p^5\, 3s^1$ shows

• A. Excited state of $O^-_2$
• B. Excited state of neon
• C. Excited state of fluorine
• D. Ground state of fluorine atom

Answer 1

Answer: (B)

Excited state of neon

Answer 2

The ground state of neon is $1s^2 2s^2 2p^6$ . On excitation an electron from $2p$ jumps to $3s$ orbital. The excited neon configuration is $1s^22s^22p^53s^1$