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Question: Answered & Verified by Expert
If the lattice parameter for a crystalline structure is $3.6 Å$, then the atomic radius in fcc crystal is
ChemistrySolid StateNEETNEET 2008 (Screening)
Options:
  • A $1.81 Å$
  • B $2.10 Å$
  • C $2.92 Å$
  • D $1.27 Å$
Solution:
1656 Upvotes Verified Answer
The correct answer is: $1.27 Å$
Atomic radius is the distance between two nearest neighbours. For fcc crystal Atomic radius $=\frac{1}{2 \sqrt{2}} \times$ lattice parameter
or $r=\frac{a}{2 \sqrt{2}}$
or $r=\frac{3.6}{2 \sqrt{2}} Å=1.27 Å$

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