Solution: We expect the atomic radius to increase down a

Chapter 19, Problem 19.12

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We expect the atomic radius to increase down a group in the periodic table. Can you suggest why the atomic radius of hafnium breaks this rule? (See the following data.) Element Atomic Radius () Element Atomic Radius () Sc 1.57 Ti 1.477 Y 1.693 Zr 1.593 La 1.915 Hf 1.476

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