Question

The four quantum numbers of the valence electron of potassium are

• 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$\frac{1}{2}$

Answer 1

Answer: (C)

Atomic number of potassium is $19$ and hence electronic configuration will be $1s^2,2s^2,2p^6,3s^2,3p^6,4s^1$ Hence for $4s^1$ electron value of Quantum number are
Principal quantum number $n=4$
Azimuthal quantum number $l=0$
Magnetic quantum number $m=0$
Spin quantum number s = $+1/2$