The lanthanide contraction is responsible for | vedclass

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

Question

(C) Due to lanthanide contraction,the atomic radii of $Zr$ and $Hf$ are nearly identical.Lanthanide contraction is explained by the poor shielding eff

Vedclass · Accepted Answer

$Zr$ and $Hf$ have about the same radius

Vedclass · Answer

(C) Due to lanthanide contraction,the atomic radii of $Zr$ and $Hf$ are nearly identical.Lanthanide contraction is explained by the poor shielding effect of $4f$ electrons.In multi-electron atoms,inner electrons shield outer electrons from the nuclear charge.The shielding efficiency follows the order $s > p > d > f$.Because the $4f$ subshell provides poor shielding,the effective nuclear charge experienced by the outer electrons increases,leading to a smaller atomic size.In the case of $Hf$ $(Z = 72)$,the filling of the $4f$ subshell results in a smaller size than expected,making it comparable to $Zr$ $(Z = 40)$.

The lanthanide contraction is responsible for the fact that

Similar Questions

Crotonyl alcohol is an example of

Fog is a colloidal solution of

Sodium and copper have work functions of $2.3 \ eV$ and $4.5 \ eV$ respectively. The ratio of their threshold wavelengths is nearest to:

$\int\left(\sqrt{\frac{a+x}{a-x}}+\sqrt{\frac{a-x}{a+x}}\right) d x$ is equal to

Vedclass Test Series

Exam Paper Generator

Online Exam Module