The Aufbau principle is not satisfied by whic | vedclass

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

Question

(B) The Aufbau principle states that electrons fill lower energy orbitals before higher energy ones. Exceptions to this rule occur due to the extra st

Vedclass · Accepted Answer

$Cu$ and $Ag$

Vedclass · Answer

(B) The Aufbau principle states that electrons fill lower energy orbitals before higher energy ones. Exceptions to this rule occur due to the extra stability provided by half-filled or fully-filled $d$-orbitals. For $Cr$ $(Z=24)$,the configuration is $[Ar] 3d^5 4s^1$ instead of $[Ar] 3d^4 4s^2$. For $Cu$ $(Z=29)$,the configuration is $[Ar] 3d^{10} 4s^1$ instead of $[Ar] 3d^9 4s^2$. Similarly,$Ag$ $(Z=47)$ shows an exceptional configuration of $[Kr] 4d^{10} 5s^1$. Therefore,the pair $Cu$ and $Ag$ exhibits deviations from the standard Aufbau filling order.

The Aufbau principle is not satisfied by which of the following pairs of elements?

Similar Questions

The number of orbitals with $n = 5, m_{l} = +2$ is $......$ . (Round off to the Nearest Integer)

The electronic configuration,which obeys Hund's rule for the ground state of carbon atom is

Which of the following notations of an orbital is incorrect considering the sign of the wave function?

The total number of electrons in all orbitals having principal quantum number $n = 2$ and azimuthal quantum number $l = 1$ is ..........

In an atom, the order of increasing energy of electrons with quantum numbers $(i)$ $n=4, l=1$, (ii) $n=4, l=0$, (iii) $n=3, l=2$, and (iv) $n=3, l=1$ is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module