Question
Tue June 19, 2012 By: Aakanksha

Aluminium forms ccp structure. its radius is 125*10to the power (-12)m. a)calculate the edge length b)how many such unit cells are there?

Expert Reply
Tue June 19, 2012
r = a/2?2
a =125 x 10-12 x 2?2
   =354 x 10-12
Volume of unit cell (a3) = (354 x 10-12)m
                                  =4.436 x 10 -29 m3
no of unit cells in 1m3 of Al = 1 / 4.436 x 10-29
                                                       = 2.25 x 1028
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