Which pair of sub-shell has same energy for above described exceptional element under rule (a)?
5p, 4s
2s, 2p
1s, 2s
3d, 4p
A
1s, 2s
B
2s, 2p
C
3d, 4p
D
5p, 4s
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Solution
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3d and 4p have same energy as 3+2 =5 and 4+1 =5.
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