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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

Which of the following statements related to lanthanoids is incorrect?

Arrange the following metal complexes/compounds in the increasing order of spin-only magnetic moment. Presume all three are high-spin systems.
(Atomic numbers: $Ce = 58$,$Gd = 64$,and $Eu = 63$.)
$(a)$ $(NH_4)_2[Ce(NO_3)_6]$
$(b)$ $Gd(NO_3)_3$
$(c)$ $Eu(NO_3)_3$
Answer is:

Which of the following elements can form compounds in $+3$ to $+7$ oxidation states?

Which element from the following has the smallest ionic size in the $+3$ oxidation state?

Which statement is incorrect among the following?

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