The decreasing order of energy for the electrons represented by the following sets of quantum number is :
1.`n = 4,l = 0,m = 0,s = +- 1//2`
2.`n = 3,l = 1,m = 1,s = - 1//2`
3.`n = 3,l = 2,m = 0,s = + 1//2`
4.`n = 3,l = 0,m = 0,s = - 1//2`

Explanation

Find `( n + l)` for each set
` For (1) ( n + l) = 4 i.e., 4s`
` For (2) ( n + l) = 4 i., e , 3 p`
` For (3) ( n+ l) =5 i.e, 3d`
` For (4) ( n + l) =3 i.e, 3s`
(1) Lower is the value of `( n + l)` lower is energy level .
(2) If `( n +l)` are same then orbital with lower values of ( n) possesses lower energy .
`:.` Decreasing ofer of energy ` 3 gt 1 gt 2 gt 4 .`