The electrons identified by quantum numbers n and l,
(i) n=3,l=0 (ii) n=4,l=0
(iii) n=3,l=2 (iv) n=3,l=1
can be placed in order of increasing energy from lowest to highest as

Options

A. (iv) < (ii) < (iii) < (i)
B. (i) < (iv) < (ii) < (iii)
C. (i) < (iii) < (ii) < (iv)
D. (iii) < (i) < (iv) < (ii)

Answer

A

Explanation

(i) 4p (ii) 4s (iii) 3d (iv) 3p
These can be arranged in order of increasign energy as
`3plt 4slt 3d lt 4p`
I.e. (iv) < (ii) < (iii) < (i)