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Which of the following quantum number combinations is not allowed in a ground-state atom? (7, 4, -2, -½) (3, 0, 0, +½) (2, 1, 1, -½) (3, 2, 3, +½)

Carlton Burgess

in Chemistry

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Cynthia Baker on September 3, 2018

The last combination (3,2,3,+1/2) is not allowed.The quantum numbers are (n, l, ml, s)l, the second quantum number, can take values from 0 to n - 1; so:n = 3 => l can be 0, 1, or 2 => the first and second quantum numbers are a valid combination.The third quantum number, ml, runs from - l to +l, so that, since l is lower than 3, ml can't be 3. That is why this is not a valid combination.


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