Four possible electron configurations for a nitrogen atom are shown below, but only one schematic represents the correct configuration for a nitrogen atom in its ground state. Which one is the correct electron configuration? Which configurations violate the Pauli exclusion principle? Which configurations violate Hund’s rule?

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Configuration A 1 1L 1s 2s Configuration B1 1s Configuration C11 1s 11 2s 1L 1 2p Configuration D 11 11 1s 2s 1 1 1 2p 11 11 1 2s 2p 2p