What are Atomic and Ionic Radii of D-Block Elements - QS Study
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Atomic and Ionic Radii of D-Block Elements:

The atomic and ionic radii of transition elements are smaller than those of pblock elements and larger than those of s-block elements. The atomic and ionic radii of first transition elements are given in the Table.

Table: Atomic radii of elements of first transition series

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The atomic radii of first transition series decreases from Sc to Cr and remains almost constant till Cu and then increases towards the end. This can be explained based on two effects namely screening and the nuclear charge effect. These two effects oppose each other resulting in increase in nuclear charge. Hence very slight variation in the atomic radii from Cr to Cu is observed.

It has been observed that Zirconium and Hafnium have almost equal atomic radii. This is because of lanthanide contraction.