1. Tardigrade
  2. Question
  3. Chemistry
  4. How many of the following pairs have approximately equal radii? ( Zr , HF ) ;( Nb , Ta ) ;( Cr , Mn ) ;( Mn , Fe ) ;( Nb 3+, Ta 3+) ;( Zr 4+, Hf 4+)

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Q. How many of the following pairs have approximately equal radii?
$( Zr , HF ) ;( Nb , Ta ) ;( Cr , Mn ) ;( Mn , Fe ) ;\left( Nb ^{3+}, Ta ^{3+}\right) ;\left( Zr ^{4+}, Hf ^{4+}\right)$

The d-and f-Block Elements

Solution:

Correct answer is '6'