APFIVE Excited State Electron Configuration
Which of the following electron configurations represents an atom in an excited state?
A
1s²2s²2p⁶3s²3p⁶4s¹
B
1s²2s¹2p⁴
C
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶
D
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s¹
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