The Hydrogen-Like Elements (Valence +1)exhibit a Splitting of the Energy

The hydrogen-like elements (valence +1) exhibit a splitting of the energy states without an external magnetic field; this is due to

A) the interaction of the spin and orbital angular momenta.
B) the penetration of the electron into the inert core of filled subshells.
C) the fact that in a downward transition the orbital angular momentum must change by one.
D) the requirement that no two electrons can be in the same state at the same time.
E) None of these is correct.

Correct Answer:

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