How will you distinguish between the following pairs of terms

Hexagonal close packing and cubic close packing.

The spheres of molecules of a particular row 

In a particular dimension are in a position that they fit into depressions between adjacent spheres of the previous row.The spheres of molecules are adjacent to each other that each row of sheres in a particular dimension is a repetition of the previous row.

The spheres of a particles row fit in the depressions between two adjacent spheres of the previous row.  The spheres of a particular row don’t fit in the depression between two adjacent spheres of the previous row.

This type of packed lattice is found in many metals such as magnesium, zinc,etc.

Volume of the unit cell is 24 √(2 )r3This type of close packing of constituent particles is found in metals like copper, silver, etc.

Volume of the unit cell is 16 √(2 )r3