The four quantum number of valence electron of potassium z 19
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Explanation:
Principal Quantum no is 4 as it is present in the 4th shell
Azimuthal Quantum no. 0 as it is s group (4-s)
Spin Quantum no can be either +1/2 or -1/2 depends and is coventionally taken to be positive
The L value of this s orbital is 0. so the magnetic quantum number will be +l to -l and
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