Question

Which of the following statements concerning ground state electron configurations is/are CORRECT?
1/ For a hydrogen atom with one electron, the 2s and 2p orbitals have identical energies.
2/ For a lithium atom with three electrons, the 2s and 2p orbitals have different energies.
3/ The effective nuclear charge felt by an electron in a 2p orbital is greater for a carbon atom than for a boron atom.
A.1 only
B.2 only
C.3 only
D.2 and 3
E.1, 2, and 3

Answer

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