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In a hydrogen atom, which statement about the relative energies of these orbitals is true?

1. The 3s, 3p, and 3d orbitals all possess equal energy.
2. The 3s and 3p orbitals have lower energy than the 3d orbital.
3. The 3p orbital has lower energy than the 3d orbital.
4. The 3s orbital has lower energy than the 3p orbital.

Correct answer: The 3s, 3p, and 3d orbitals all possess equal energy.

Solution

For the hydrogen atom the 3s, 3p and 3d orbitals are degenerate (energy depends only on n), so option 0 is correct. The stored statement that 3s is lower than 3p holds only for multi-electron atoms.

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