How many particles are there in a body-centred and a face-centred cubic unit cell?

In face-centred cubic unit cell :

What is a face-centred cubic unit cell?

Determine the ratio of radii of particles in simple, body-centred and face-centred cubic unit cells. Assume the edge length of each type of unit cell is a.

What are the percentages of empty space in body-centred and face-centred cubic unit cells?

Define face centred cubic and body centred cubic unit cell.

The number of atoms in a face centred cubic unit cell is:

The number of atoms in a face centred cubic unit cell is:

The number of atoms in a face centred cubic unit cell is: