What is the relationship between the edge length (a) of the unit cell and radius ( r) of an atom in a face centred unit cell?

How many number of atoms are present in face centered cubic unit cell?

The total number of tetrahedral voids in the face centred unit cell is

Define the following terms : Face centred unit cell

The fraction of volume occupied by atoms in a face centered cubic unit cell is:

The number of atoms present in a fcc unit cell is

What are the number of atoms per unit cell and the number of nearest neighbours in a face centered cubic structure?

packing fraction of a unit cell is drfined as the fraction of the total volume of the unit cell occupied by the atom(s). P.E=("Volume of the atoms(s) present in a unit cell")/("Volume of unit cell")=(Zxx(4)/(3)pir^(3))/(a^(3)) and % of empty space = 100- P.F.xx100 where Z= effective number of stoms in s cube . r= radius of a an atoms a = edge lenght of the cube Packing fraction in face centered cubic unit cell is :

A Metal crystallizes in fcc lattice and the edge of the unit cell is 620 pm. The radius of metal atom is