Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Following figure shows an FCC unit cell with atoms of radius r marked 1(corner), 2(face center), 3(face center). A quadrilateral is also shown by joining the centers of 4 face centered atoms.
Find : (i) The distances between atoms 1 & 2, 2 & 3 and 1 & 3.
(ii) The shape and dimensions of the quadrilateral.
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i) 2r, 2r, 
; (ii) Square, side = 2r.
(i) distance between 1 and 2 = 2r
2 and 3 = 2r 
1 and 3 = 
= (2 
)r
(ii) Shape = square and length of square = 2r 
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