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Question

According to Aufbau principle, the correct order of energy of 3d, 4s and 4 p-orbitals is

A
4p < 3d < 4s
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B
4s < 4p < 3d
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C
4s < 3d < 4p
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D
3d < 4s < 4p
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Solution

The correct option is C 4s < 3d < 4p

4s<3d<4p

Using (n + l) rule


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