Class 12 NEET Chemistry D And F Block Elements Questions

● The cumulative effect of the contraction of the lanthanoid series, known as lanthanoid contraction, causes the radii of the members of the third transition series to be very similar to those of the corresponding members of the second series.
● The almost identical radii of Zr (160 pm) and Hf (159 pm) is a consequence of the lanthanoid contraction.