Exclusion Principle: The electron spin quantum number can have values of
A. -1/2, -1, 0, +1, +1/2.
B. -1/2, -1, +1, +1/2.
C. -1/2, 0, +1/2.
D. -1/2, +1/2.
E. only +1/2.
Answer: D
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