2-2-1 electronic configuration represents an atom in an excited state.
What is electronic configuration?
Electronic configuration is the distribution of electrons into various orbitals of an atom.
What is an excited state?
Excited state is an increase in the energy level above a chosen starting point, usually the ground state.
An electronic configuration representing an atom in the excited state show a valence electron promoted to a higher energy level.
1s² 2s² 3p¹
Hence, option D is the correct answer.
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