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Although Zr belongs to 4d and Hf belongs...

Although Zr belongs to 4d and Hf belongs to 5d- transition series but it is quite difficult to separate them. why ?

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Separation of Zr and Hf are quite difficult because of lanthanoid contraction. Due to lanthanoid contraction, they have almost same size (Zr = 160 pm and Hf = 159 pm) and thus, similar chemical properties. That.s why, it is very difficult to separate them by chemical methods.
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