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.

List-$I$ (Orbital)	List-$II$ (Radial nodes and nodal plane)
$A$. $2s$	$I$. $1$ Radial node + two nodal planes
$B$. $3s$	$II$. $1$ Radial node + one nodal plane
$C$. $3p$	$III$. $2$ Radial nodes + No nodal plane
$D$. $4d$	$IV$. $1$ Radial node + No nodal plane

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

Similar Questions

The element with the electronic configuration $1s^2 2s^2 2p^6 3s^2 3p^6 3d^{10} 4s^1$ is

Which of the following statements concerning the four quantum numbers is false?

Match the $LIST$-$I$ with $LIST$-$II$:
List-$I$ (Orbital) List-$II$ (Radial nodes and nodal plane)
$A$. $2s$ $I$. $1$ Radial node + two nodal planes
$B$. $3s$ $II$. $1$ Radial node + one nodal plane
$C$. $3p$ $III$. $2$ Radial nodes + No nodal plane
$D$. $4d$ $IV$. $1$ Radial node + No nodal plane

Given below are two statements:
Statement-$I$: The orbitals having same energy are called as degenerate orbitals.
Statement-$II$: In hydrogen atom,$3p$ and $3d$ orbitals are not degenerate orbitals.
In the light of the above statements,choose the most appropriate answer from the options given.

What are the spins of the two electrons in $He$?

Vedclass Test Series

Exam Paper Generator

Online Exam Module