Which of the following is/are correct energy order for H-atom?
1s < 2s < 2p < 3s < 3p
1s < 2s < 4s < 3d
1s < 2s = 2p < 3s = 3p
1s < 2p < 3d < 4s
A
1s < 2p < 3d < 4s
B
1s < 2s = 2p < 3s = 3p
C
1s < 2s < 2p < 3s < 3p
D
1s < 2s < 4s < 3d
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Solution
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Energy of orbital of hydrogen depends upon n+l rule. For,
1s: n+l=1 2s: n+l=2 2p: n+l=3 3s: n+l=3 3p: n+l=4 3d: n+l=5 4s: n+l=4 Hence, energy order is 1s<2s<2p<3s<3p<4s<3d.
Therefore, option A and D are correct.
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