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

(iv) lt (ii) lt (iii) lt (i)
According to Aflau's principal filing of electron in verious subshells of an atom taken place in the increasing value of energy staring with the lower most .The following order is observed
`1s 2s 3s 3p 4s 3d 5s 4d 5p 6s 4f 5d 6p 7s……`According to Bohr- Bury rule `( n + 1)` rule, the sub-shell with the lower value of `(n + 1)` is filled first if the values for `(n + 1)` are equal, the one with the smaller value of n filled first