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MCAT Question A Day - 10/26/14 - Answer!

Compared to an electron with a principal quantum number of 1, an electron with a principal quantum number of 2 will have:

A.  a lower energy.
B.  a higher energy.
C.  a negative spin.
D.  a positive spin.

B is correct. The principle quantum number (n) represents the energy level of the electron. The lowest energy shell is n ~ 1. As n increases, the shells move farther from the nucleus and energy increases.

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