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Question

In potassium, the order of energy levels is:
  1. 3s > 3d
  2. 4s > 4p
  3. 4s < 3d
  4. 4s = 3d

A
4s > 4p
B
4s = 3d
C
3s > 3d
D
4s < 3d
Solution
Verified by Toppr

The correct option is B 4s < 3d
The "4s" orbital is having lower energy than "3d" orbital.

The (n+l) value of "4s" orbital is lower than that of "3d" orbital.

Option B is correct.

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