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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
The correct order of increasing energy of the listed orbitals in the atom of titanium is 3s<3p<4s<3d.
The energy of 4s orbital is lower than the energy of 3d orbital.
Due to this, 4s orbital is filled first followed by 3d orbital.

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