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Aluminium crystallizes in an fcc structu...

Aluminium crystallizes in an fcc structure. Atomic radius of the metal is 125 pm.
What is the length of the edge of the unit cell ?

A

250 pm

B

353.5 pm

C

176 pm

D

216.5 pm

Text Solution

Verified by Experts

The correct Answer is:
B
For a c.c.p. structure
`sqrt2a=4r`
`a=(4r)/sqrt2 `
(a=edge length, r=radius of atom)
`a=2sqrt2r=2sqrt2 125=353.5" pm"`
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