1.

Total volume of atoms present in face centred cubic unit cell of metal is ( r is atomic radius )

Answer»

`( 24)/( 3) pi r^(3)`
`( 12)/( 3) pi r^(3)`
`( 16)/( 3) pi r^(3)`
`( 20)/( 3) pi r^(3)`

Solution :No. of atoms present per UNIT cell in FCC arrangement =4
Total volume of atoms present
`= 4 xx ( 4)/( 3) pi r^(3) = ( 16)/( 3) pi r^(3)`


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