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Question: Answered & Verified by Expert
The four quantum numbers of the valence electron of potassium are
ChemistryStructure of AtomJEE Main
Options:
  • A $4,1,0$ and $\frac{1}{2}$
  • B $4,0,1$ and $\frac{1}{2}$
  • C $4,0,0$ and $+\frac{1}{2}$
  • D 4,1,1 and $\frac{1}{2}$
Solution:
1776 Upvotes Verified Answer
The correct answer is: $4,0,0$ and $+\frac{1}{2}$
Atomic number of potassium is 19 and hence electronic configurtion will be $1 s^2, 2 s^2, 2 p^6, 3 s^2, 3 p^6, 4 s^1$
Hence for $4 s^1$ electron value of Quantum number are
Prncipal quantum number $n=4$
Azimuthal quantum number $I=0$
Magnetic quantum number $m=0$
Spin quantum number $s=+1 / 2$

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