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Question

Which pair of sub-shell has same energy for above described exceptional element under rule(a)?
  1. 1s, 2s
  2. 2s, 2p
  3. 3d, 4p
  4. 5p, 4d

A
1s, 2s
B
2s, 2p
C
5p, 4d
D
3d, 4p
Solution
Verified by Toppr

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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