In a cubic close packing of spheres in three dimensions, the co-ordination number of each sphere?
6
9
3
12

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In cubic close packing the atoms are present at corners and face center of the unit cell.
As the atom present at face center touches $12$ atoms of face centers . $4$ in its plane , $8$ outside the plane..
hence the co- ordination number is $12$ .

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In a cubic close packing of spheres in three dimensions, the co-ordination number of each sphere?69312

In cubic close packing the atoms are present at corners and face center of the unit cell.As the atom present at face center touches 12 atoms of face centers . 4 in its plane , 8 outside the plane..hence the co- ordination number is 12.

In a cubic close packing of spheres in three dimensions, the co-ordination number of each sphere?
6
9
3
12

In cubic close packing the atoms are present at corners and face center of the unit cell.
As the atom present at face center touches $12$ atoms of face centers . $4$ in its plane , $8$ outside the plane..
hence the co- ordination number is $12$ .