Question

give the possible values of l, m and s for electron having n=2​

Answer 1

For 'n' = 2, the permitted value of 'l' will be

0 to ( n-1 ) i.e. 0 and 1.

For 'l' = 1, the permitted value of 'm' will be from -l to +l including 0.

So, 'm' = -1,0,+1

For an electron there are only to value of s i.e. clockwise and counterclockwise.