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

1. 3s, 4s, 3p, 3d
2. 4s, 3s, 3p, 3d
3. 3s, 3p, 3d, 4s
4. 3s, 3p, 4s, 3d

Correct answer: 3s, 3p, 4s, 3d

Solution

The energy of orbitals increases as per the (n+l) rule, where n is the principal quantum number and l is the azimuthal quantum number. For titanium, the correct order is 3s < 3p < 4s < 3d.

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