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Aufbau Principle

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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
$4 s < 3 d < 4 p$

Using (n + l) rule

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