Question

In multi electron atom which of the following orbitals described by the three quantum numbers will have same energy in the absence of magnetic and electrical field?
1) n=1,l=0,m=0
2)n=2,l=0,m=0
3)n=2,l=1,m=1
4)n=3,l=2,m=1
5)n=3,l=2,m=0

(a) 3and 4
(b) 4 and 5
(c) 1 and 2
(d) 2 and 3

Answer 1

Orbitals having (n+l) same possess same energy in absence of magnetic field.
Hence b is the correct answer.

Answer 2

(b) 4 and 5 is the correct answer