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Aluminium crystallises in a cubic close-...

Aluminium crystallises in a cubic close-packed structure. Radius of the atom in the metal is 125 pm.
What is the length of the side of the unit cell?

A

354 pm, 2.254 x `10^22` unit cells

B

254 pm, 3.254 x `10^22` unit cells

C

454 pm, 4.254 x `10^22 ` unit cells

D

654 pm, 5.254 x `10^22` unit cells

Text Solution

Verified by Experts

The correct Answer is:
A
`a =(4r)/(sqrt2) = r xx 2sqrt2 = 125 xx 10^(-12) xx 2 sqrt2 = 354` pm
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