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Q.
The configuration $1s^2 \,2s^2\, 2p^5\, 3s^1$ shows
Structure of Atom
Solution:
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 $1s^22s^22p^53s^1$