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Question

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?(At. no. Z = 22)


A

3s 3p 3d 4s

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

The correct option is B 3s 3p 4s 3d
This can be solved by using Aufbau Principle.
1s, 2s, 2p, 3s, 3p, 4s, 3d is the inceasing energy level.
This can also be arrived at using the (n + l) rule

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