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Al (atomic mass =27) crystallises in a c...

Al (atomic mass =27) crystallises in a cubic system with edge length (a) equal to `4Å` its density is `2.7 g//cm^(3)` The type of the unit cell is:

A

Simple

B

Face centred

C

Body centred

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
Density `(rho)=(ZxxM)/(N_(0)xxa^(3))`
`2.7=(Zxx27)/(6.022xx10^(23)xx(4)^(3)xx(10^(-24)))`
On calculation, Z=4 (face centred)
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