Question

19) If the magnetic quantum number has a value of 3, the electron may be
residing in the atomic orbital *
a) 5s
(0)
b) 4f
c) 5d
O
d) 3p
W​

Answer 1

option d is a correct answer

Answer 2

The magnetic quantum number gives us information about the number of orbitals present in any subshell and their orientation.

Explanation:

For a value of l, m = $-l$ to $+l$. This includes zero. Now,

• A) 5s = For s-subshell, $l=0$. So $m=0$. So the countable value is 1. This wrong option.
• B) 4f = For f-subshell,$l=3$. So $m= +3 +2 +1, 0 -1 -2 -3$. The value is 7. This is the wrong option.
• C) 5d = For d sub-shell, $l=2$. So $m= +2 +1,0 -1 -2$. The value is 5. This is the wrong option.
• D) 3p = For p sub-shell, $l=1$. So $m= +1 ,0, -1$. The value is 3. This is the correct option.

So, the answer is option D.

The magnetic quantum number depends upon the azimuthal quantum number, that why we are not considering the principal quantum number while solving this question.