The Lanthanoid contraction is responsible for | vedclass

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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 acts as a strong reducing agent? (Atomic number: $Ce=58, Eu=63, Gd=64, Lu=71$)

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