Which electronic configuration does not follo | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The $(n + l)$ rule states that orbitals are filled in increasing order of $(n + l)$ values.For $4s$,$(n + l) = 4 + 0 = 4$.For $3d$,$(n + l) = 3 +

Vedclass · Accepted Answer

$1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^5, 4s^1$

Vedclass · Answer

(C) The $(n + l)$ rule states that orbitals are filled in increasing order of $(n + l)$ values.For $4s$,$(n + l) = 4 + 0 = 4$.For $3d$,$(n + l) = 3 + 2 = 5$.According to the rule,$4s$ should be filled before $3d$.In option $(C)$,the configuration $3d^5, 4s^1$ represents Chromium $(Z=24)$.While this configuration is stable due to the half-filled $d$-subshell,it technically violates the Aufbau principle (which is based on the $(n+l)$ rule) because an electron is placed in $3d$ before $4s$ is completely filled with $2$ electrons.

Which electronic configuration does not follow the $(n + l)$ rule?

Similar Questions

What is an atomic orbital?

The number of unpaired electrons in $1s^2 2s^2 2p^3$ is:

The orbital angular momentum of an electron in an $s$ orbital is

The total number of unpaired electrons in $d$-orbitals of atoms of element of atomic number $29$ is

Select the set of quantum numbers which is $NOT$ associated with any electron in $Cr$ $(Z = 24)$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module