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(C) The elements following the lanthanoids in the periodic table are influenced by the lanthanoid contraction. For example, the atomic radius of the m

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

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(C) The elements following the lanthanoids in the periodic table are influenced by the lanthanoid contraction. For example, the atomic radius of the metal zirconium, $Zr$, (a period $-5$ transition element) is $159 \ pm$ and that of hafnium, $Hf$, (the corresponding period $-6$ element) is $156 \ pm$. The radii are very similar even though the number of electrons increases from $40$ to $72$ and the atomic mass increases from $91.22$ to $178.49 \ g/mol$. The increase in mass and the nearly unchanged radii lead to a steep increase in density from $6.51$ to $13.35 \ g/cm^3$. Zirconium and hafnium, therefore, have very similar chemical behaviour, having closely similar radii and electron configurations. Radius-dependent properties such as lattice energies, solvation energies, and stability constants of complexes are also similar.

The Lanthanoid contraction is responsible for the fact that

Similar Questions

Assertion : Magnetic moment of $Dy^{3+}$ is highest among lanthanoids.
Reason : Orbital motion contributes to the magnetic moment.

The trivalent ion having the largest size in the lanthanide series is:

Consider the following two statements:
$Statement-I:$ Among $Mg, Al, Mg^{2+}, Al^{3+}$,the one having the smallest size is $Al^{3+}$.
$Statement-II:$ $Eu$ has an exceptionally high atomic radius among lanthanide elements.
The correct answer is:

Explain $f$-block elements of the periodic table in detail.

Although $(+3)$ oxidation state is the characteristic oxidation state of lanthanoids,cerium shows $(+4)$ oxidation state also. Why?

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