Answer:
This is because of lanthanoid
contraction in the members of the lanthanoid family (Z = 58 to Z = 71) which
occupy a position along with Lanthanum (Z = 57) in the periodic table. However,
these are placed separately at the bottom of the table in the\[f\]-block. The
lanthanoid contraction also decreases the size of the elements of the third
transition series (Hf onwards). As a result, there is a negligible difference
in the metallic radii of the second and third members in each group of
transition metals. For more details, consult Section 8.4.
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