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

Options

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

Answer

A

Explanation

(i) `n = 4, l = 1 (4p)`, (ii) `n = 4, l = 0 (4s)`
(iii) `n = 3, l = 2 (3d)`, (iv) `n = 3, l = 1 (3p)`
Order increasing energy
`3p lt 4s lt 3d lt 4p` or `(iv) lt (ii) lt (iii) lt (i)`.