The quantum numbers of six electrons are give below. Arrange them in order of increasing energies. List if any of these combination(s) has/have the same
energy: (1) n=4,l=2,`m_(l)=2,m_(S)=-(1)/(2)`
(2) `n=3,l=2,m_(l)=1,m_(S)=+(1)/(2)`
(3) n=4,l=1,`m_(l)=0,m_(S)=+(1)/(2)`
(4) `n=3,l=2,m_(l)=-2,m_(S)=-(1)/(2)`
(5) `n=3,l=1,m_(l)=-1,m_(S)=+(1)/(2)`
(6) n=4, l=1, `m_(l)=-1,m_(S)=+(1)/(2)`.

Explanation

The orbital occupied by the electrons that are designated by the given sets of quantum numbers are (1) 4d (2) 3d (3) 4p (4) 3d (5) 3p (6) 4p
so, increasing order of their energies will be-
`(5) lt (2)=(4) lt (6)=(3) lt (1)`.