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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 $$\displaystyle 3s < 3p < 4s < 3d $$.
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.

Chemistry

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