alleryZirconium measures 160 pm and hafnium measures about:
A140 pm
B200 pm
C159 pm
D180 pm
Answer & Solution
Correct answer: C. 159 pm
1. The lanthanoid contraction brings the two very close.
2. Zirconium comes in at 160 picometres.
3. Hafnium comes in at 159 picometres.
_Source: syllabus Chemistry Part I, Chapter 8, The d- and f-Block Elements._
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