The quantum numbers of six electrons are given below. Arrange them in order of increasing energies. Do any of these combination have 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) = 0,m_(s) = +1//2,):}`

Explanation

The order or increasing energies is :
`5<2 =4<3 = 6<1 `
2 and 4 electrons have the same energy, similarly 3 and 6 electrons also have same energy