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Why do Zr and Hf exhibit similar propert...

Why do Zr and Hf exhibit similar properties?

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Zirconium (Zr, Z = 40) belongs to second series of d-block transition elements and Hafnium (Hf, Z = 72) belongs to third series of d-block transition elements. These show similar chemical and physical properties because they have similar atomic radii (Zr = 159 pm and Hf = 156 pm) due to lanthanoid contraction.
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