Out of the following, which is the correct set of quantum number for the outermost electron of potassium atom (Z = 19)?

Question

Out of the following, which is the correct set of quantum number for the outermost electron of potassium atom (Z = 19)? (A) n-4 l-3 m-2 s-(-1/2) (B) n-4 l-2 m-0 s-(-1/2) (C) n-4 l-1 m-0 s- 1/2 (D) n-4 l-0 m-0 s- (-1/2)

Tardigrade Admin · Accepted Answer

The electronic configuration of potassium is 19 K=1 s2, 2 s2, 2 p6, 3 s2, 3 p6, 4 s1 For 4 s1, n=4 l=0 (∵ for s orbital, l=0) m=0 s =-(1/2)

Q. Out of the following, which is the correct set of quantum number for the outermost electron of potassium atom $(Z = 19)$ ?

n-4 l-3 m-2 s-(-1/2)

n-4 l-2 m-0 s-(-1/2)

n-4 l-1 m-0 s- 1/2

n-4 l-0 m-0 s- (-1/2)

The electronic configuration of potassium is
$_{19} K = 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 4 s^{1}$
For $4 s^{1}$ ,
$n = 4 l = 0$
$(∵$ for s orbital, $l = 0) m = 0 s = - \frac{1}{2}$

Q. Out of the following, which is the correct set of quantum number for the outermost electron of potassium atom(Z=19)?