Which of the following electron configurations ... - SS2 Physics Modern Physics - Quantum Mechanics Question
Which of the following electron configurations represents an atom in an excited state?
A
1s²2s²2p⁶3s²3p⁶
B
1s²2s²2p⁶3s²3p⁵
C
1s²2s²2p⁶3s²3p⁴
D
1s²2s²2p⁶3s¹
correct option: b
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