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Q.

Which of the two has an almost similar size

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a

 Ca20 and Ir31

b

 22Ti and 40Zr 

c

 Nb41 and 73Ta

d

 39Y and 57La 

answer is B.

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Detailed Solution

  • The regular decrease in the atomic and ionic radii of lanthanoids with increasing in atomic number is known as Lanthanoid contraction.
  • Due to lanthanoid contraction 2nd and 3rd transition series are nearly same size.(Ex : Zr and Hf : Nb and Ta.....)
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