Difficult
The four quantum numbers for the electron in the outermost orbital of potassium (atomic number $19$) are:
- A$n=4, l=2, m=-1, s=+\frac{1}{2}$
- B$n=4, l=0, m=0, s=+\frac{1}{2}$
- C$n=3, l=0, m=1, s=+\frac{1}{2}$
- D$n=2, l=0, m=0, s=+\frac{1}{2}$
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