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प्रश्न
Why do zirconium and Hafnium exhibit similar properties?
उत्तर
- The element of the second and third transition series resemble each other more closely than the elements of the first and second transition series due to lanthanoid contraction.
- e.g., Zr – 4d series -Atomic radius 145 pm Hf – 5d series – Atomic radius 144 pm
- The radii are very similar even though the number of electrons increases.
- Zr and Hf have very similar chemical behaviour, having closely similar radii and electronic configurations.
- Radius-dependent properties such as lattice energy, solvation energy are similar.
- Thus lanthanides contraction leads to the formation of pair of elements and those known as chemical twins, e.g., Zr – Hf
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