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Aluminium crystallises in c.c.p. structu...

Aluminium crystallises in c.c.p. structure. Metallic radius of aluminium is 125 pm. Edge length of the unit cell of aluminium is

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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