alleryZirconium and hafnium have radii that are nearly:
AHalf apart
BThe same
CVery far
DTwice apart
Answer & Solution
Correct answer: B. The same
1. The lanthanoid contraction cancels the expected size increase.
2. So the second and third d series end up alike.
3. Zirconium and hafnium have almost the same radius.
_Source: syllabus Chemistry Part I, Chapter 8, The d- and f-Block Elements._
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