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Q.

In potassium the order of energy levels is

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a

4s > 3d

b

4s < 3d

c

4s < 3p

d

4s = 3d

answer is B.

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Detailed Solution

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