Exclusion Principle: Consider ground-state helium having two electrons in orbit. If one of the electrons has quantum numbers (n, ?l, m1, ms) of 1, 0, 0, -1/2 respectively, the quantum numbers for the other electron will be
A. 1, 1, 0, -1/2.
B. 1, 0, 0, +1/2.
C. 1, 1, 1, +1/2.
D. none of the given answers.
Answer: B
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