Higher second ionisation enthalpies than expe | vedclass

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

Question

(D) The electronic configuration of $Cr$ is $[Ar] 3d^5 4s^1$ and that of $Cu$ is $[Ar] 3d^{10} 4s^1$. Their second ionisation enthalpies are higher th

Vedclass · Accepted Answer

$Cr, Cu$

Vedclass · Answer

(D) The electronic configuration of $Cr$ is $[Ar] 3d^5 4s^1$ and that of $Cu$ is $[Ar] 3d^{10} 4s^1$. Their second ionisation enthalpies are higher than expected because after the removal of one electron,$Cr^+$ attains a stable half-filled $3d^5$ configuration,and $Cu^+$ attains a stable fully-filled $3d^{10}$ configuration. These configurations are significantly more stable than the configurations of their neighbors. Therefore,it requires much more energy to remove the second electron from these ions. Thus,option $(D)$ is correct.

Higher second ionisation enthalpies than expected are observed for

Similar Questions

The electronic structure $(n - 1)d^{1 - 10}ns^{0 - 2}$ is characteristic of

Which of the following pairs of elements does $NOT$ include transition elements?

An element in $+3$ oxidation state has the electronic configuration $[Ar]3d^3$. Its atomic number is

How many unpaired electrons are there in $Ni^{2+}$?

The most abundant transition metal in the earth's crust is

Vedclass Test Series

Exam Paper Generator

Online Exam Module