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Q. The properties of $ Zr $ and $ Hf $ are same because

MGIMS WardhaMGIMS Wardha 2009

Solution:

It is because of lanthanide contraction due to which ionic radii of second and third transition series are same, thus, properties of $ Zr $ and $ Hf $ are same as they have similar radii. $ Z{{r}^{4+}}(40)79\,pm $ $ H{{f}^{4+}}(72)78\,pm $