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