Why is the first ionisation enthalpy of Cr lo | vedclass

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

Question

(A) The first ionisation enthalpy depends on the effective nuclear charge and the electronic configuration of the atom.$Cr$ has the electronic configu

Vedclass · Accepted Answer

$Cr$ has a stable $d^5$ configuration,while $Zn$ has a stable $d^{10}$ configuration.

Vedclass · Answer

(A) The first ionisation enthalpy depends on the effective nuclear charge and the electronic configuration of the atom.$Cr$ has the electronic configuration $[Ar] 3d^5 4s^1$.$Zn$ has the electronic configuration $[Ar] 3d^{10} 4s^2$.Although $Cr$ has a stable half-filled $d$-subshell,the effective nuclear charge of $Zn$ $(Z=30)$ is significantly higher than that of $Cr$ $(Z=24)$.As the atomic number increases across the $3d$ series,the effective nuclear charge increases,which pulls the electrons closer to the nucleus,making them harder to remove.Therefore,the first ionisation enthalpy of $Zn$ is higher than that of $Cr$ due to its higher effective nuclear charge and the stability of the completely filled $d^{10}$ subshell.

Why is the first ionisation enthalpy of $Cr$ lower than that of $Zn$?

Similar Questions

Which of the following is wrongly matched?

The electronic configuration of $Cr^{3+}$ is

Manganese is related to which block of the periodic table?

Paramagnetism is not exhibited by

Which of the following statements is correct regarding the ions $Zn^{2+}$,$Ni^{2+}$,and $Cr^{3+}$? (Atomic numbers: $Zn = 30$,$Ni = 28$,$Cr = 24$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module