Question

A 3d electron having s=+1/2 can have magnetic quantum no

Answer 1

In 3d.

n=3
l= 2
And magnetic quantum no (m) =0 ans

Answer 2

The magnetic quantum number (m) can be any integer between -l and +l. If l = 2, m can be either -2, -1, 0, +1, or +2.

For 3d;

The magentic quatum number will be; +2, +1 , 0 , -1, -2.

It can be any one of these numbers.

As the value of m  =  +l to -l.