The dand fblock elements - Result Question 82

####82. The lanthanide contraction is responsible for the fact that

[1997]

(a) Zr and Y have about the same radius

(b) Zr and Nb have similar oxidation state

(c) Zr and Hf have about the same radius

(d) Zr and Zn have the same oxidation states (Atomic numbers : Zr=40,Y=39,Nb=41, Hf=72,Zn=30 )

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Solution:

  1. (c) We know that regular decrease in the size of the atoms and ions is called lanthanide contraction. In vertical column of transition elements there is a very small change in size and some times size is found to be same from second member to third member.The similarity in size of the atoms of Zr and Hf is evident due to the fact of lanthanide contraction. Therefore, Zr and Hf both have same radius 160pm.


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