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Question:

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?

3s3p4s3d

3s3p3d4s

3s4s3p3d

4s3s3p3d

Solution:

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