The coordination number for $Cu$ (Copper) in its crystal structure is:

If three elements $X$,$Y$ and $Z$ crystallise in a $ccp$ lattice with $X$ atoms at the corners,$Y$ atoms at the cube centre and $Z$ atoms at the edges centre,the formula of the compound will be

In a hexagonal close packing $(hcp)$ lattice,each sphere touches ................... spheres in its own layer.

The correct coordination number for the zinc ion in the zinc blende crystal structure is:

Copper crystallizes in $f.c.c.$ with a unit cell length of $361 \ pm$. What is the radius of copper atom? (in $pm$)

The $8:8$ type packing is present in which of the following?