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Which of the following set of quantum numbers (ordered n, ℓ, mℓ, ms) are possible for an electron in an atom?

Check all that apply.
2, -3, 1/2
-3, 2, 2, -1/2
5, 2, 1, -1/2
3, 2, 2, -1/2
4, 3, 4, -1/2
3, 2, 1, -1
4, 3, -2, 1/2
3, 3, 1, -1/2

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1 answer
  1. Here are the rules. If you don't know them you should.
    n = 1,2,3,4, etc..........
    l = 0,1,2, etc up to n-1
    ml = -l in increments of 1 to 0 and up to +l; i.e., for l = 2 then ml can be -2,-1,0 ,+1, +2
    ms = only +1/2 or -1/2
    Here are your first 3 answers which I will call A,B,C.
    A. 2, -3, 1/2
    B -3, 2, 2, -1/2
    C 5, 2, 1, -1/2
    A can't be correct because l can't be negative.
    B can't be right because n can't be negative.
    C is possible. The rules (read them) allow these numbers.
    You do the others.

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    DrBob222

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