The lanthanide contraction is responsible for the fact that

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The lanthanide contraction is a phenomenon where the atomic radii of the elements in the lanthanide series do not decrease as expected due to their increasing atomic number. This is because of the poor shielding capacity of f-electrons. This phenomenon results in a smaller than expected increase in atomic radius going from one row to the next in the periodic table. Zr and Hf are consecutive elements in the fourth row of the periodic table and are affected by the lanthanide contraction, which leads to them having about the same radius.

The Lanthanide Contraction Is Responsible for the Fact That