Which of the following statements in relation to the hydrogen atom is correct?

Q. Which of the following statements in relation to the hydrogen atom is correct?

A.            3s orbital is lower in energy than 3p orbital

B.            3p orbital is lower in energy than 3d orbital

C.            3s and 3p orbitals are of lower energy than 3d orbital

D.            3s, 3p and 3d orbitals all have the same energy

Answer: 3s, 3p and 3d orbitals all have the same energy