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Why Zr and Hf are alike

Exercise and reference answers

Steps
  1. 4f fills before 5d
  2. Radii fall steadily
  3. Expected growth is cancelled
  4. Zr and Hf match
Instructions
Tap the reasoning in order.

Explanation

_Source: syllabus Chemistry Part I, Chapter 8, The d- and f-Block Elements._
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