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Which set of quantum numbers describes the highest energy electron found in the ground state of a Scandium atom?

1. n = 3, l = 2,ml = -2,ms = -1/2
2. n = 4, l = 2,ml = -2,ms = -1/2
3. n = 3, l = 2,ml = +2,ms = +1/2
4. n = 3, l = 2,ml = -2,ms = +1/2
5. n = 4, l = 3,ml = -2,ms = +1/2

Why is the answer choice 4?

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