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MCAT Question A Day - 10/28/14 - Answer!

Hund's rule says that unpaired electrons in the same subshell:

A.  have opposite spins.
B.  have parallel spins.
C.  occupy the same orbital.
D.  cannot exist.

B is correct. Hund's rule says that electrons added to the same subshell will occupy empty orbitals first and the unpaired electrons will have parallel spins.

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