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In a face centered cubic cell , an the f...

In a face centered cubic cell , an the face contributes in the unit cell

A

`1//2 part`

B

`1//8 part`

C

`1 part`

D

`1//24part`

Text Solution

Verified by Experts

The correct Answer is:
A
Face centred cabic strare conttribute to `1//8` by each atoms present in the corner and `1//2` by each atom present in the face.
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The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. In a face centred cubic cell, an atom at the face contributes to the unit cell

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