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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 ls $1s^{2} 2s^{2} 2p^{6}$on excitation an
electron from $2p$ jumps to $3s$ orbital. The excited neon configuration is $1s^{2} \,2s^{2}\, 2p^{2} \,3s^{1} $