A compound made of elements 
and 
form 
structure. Atoms of 
are at the corners and atoms of 
are present at the centres of faces of cube. What is the formula of the compound?
Text Solution
Verified by ExpertsC
: A face-centred cubic unit cell contains atoms at the corner and at the centre of all faces of the cube. There are total 8 corners and each contributes one-eighth to the unit cell. As, 
atoms are present at corners,
Total 
atoms in a unit cell 
There are 6 face-centres and each contributes one-half to the unit cell. As, 
atoms are present at face-centres,
Total 
atoms in a unit cell 
Thus, the formula of the compound is 
.
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