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

The element having the electronic configuration $[Kr] 4d^{10} 4f^{14} 5s^2 5p^6 5d^2 6s^2$ belongs to:

Predict which of the following will be coloured in aqueous solution: $Ti^{3+}, V^{3+}, Cu^{+}, Sc^{3+}, Mn^{2+}, Fe^{3+},$ and $Co^{2+}$. Give reasons for each.

Which pair of compounds is expected to show similar colour in aqueous medium?

Which of the following gaseous ions has the maximum number of unpaired electrons?

Metal-metal bonding is more frequent in $4d$ or $5d$ series than in $3d$ series due to

Vedclass Test Series

Exam Paper Generator

Online Exam Module