AIPMT MAIN2008Chemistry-Solid State
AIPMT MAIN 2008 Chemistry Crystal Lattices and Unit Cells MCQ Question
Type: MCQ-conceptual-Medium
If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal is
A
1.27 Å
B
1.81 Å
C
2.10 Å
D
2.92 Å
Correct Answer
Option A
Detailed Explanation
In a face-centered cubic (fcc) crystal, the atomic radius R is related to the lattice parameter a by the formula R = a/√2. Substituting a = 3.6 Å gives R = 3.6/√2 = 1.27 Å.
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