NEETChemistryD and F Block ElementsMCQ+4 / −1
Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of :
- AHaving similar chemical properties
- BBelonging to same group
- CDiagonal relationship
- DLanthanoid contraction
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Correct answer: D
Hf is a post lanthanoid element. Due to presence of4f-orbitals which have poor shielding effect, the effective nuclear charge on valence shell electrons is more which result in the decrease of the size of Hf. This effect is known as lanthanoid contraction.
The almost identical radii of Zr (160 pm) and Hf (159 pm) is a consequence of the lanthanoid contraction.
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