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ATOMIC STRUCTURE
Question #25906
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Question
What is the order of energy levels in hydrogen atoms?
A. 1s = 2s = 2p = 3s
B. 1s < 2p < 2s < 3d
C. 1s < 2s = 2p < 3s = 3p = 3d
D. 1s < 2s < 2p < 3s
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