The electrons identified by quantum numbers n and l :-
(a) n=4, l=1 (b) n=4, l=0 (c ) n=3, l=2 (d) n=3, l=1
Can be placed in order of increasing energy as

Options

A. `(iv) lt (ii) lt (iii) lt (i)`
B. `(ii) lt (iv) lt (i) lt (iii)`
C. `(iii) lt (iii) lt (ii) lt (iv)`
D. `(iii) lt (i) lt (iv) lt (ii)`

Answer

A

Explanation

The (n+l) values for the different electrons are :
(i) 4+1=5 , (ii)4+0=4
(iii) 3+2=5 , (iv) 3+1=4
The correct increasing order of energy is :
`(iv) lt (iii) lt (ii) lt(i)`