What is the total number of atoms present in an $fcc$ unit cell?

The crystal structure of $AB$ is of $NaCl$ type. If the radius of the $A^+$ ion is $x \ pm$ and the radius of the $B^-$ ion is $y \ pm$, then the edge length of the unit cell will be ..........

$A$ cubic unit cell contains manganese ions at the corners and fluoride ions at the centres of each edge. The coordination number of the manganese ion is-

Calculate the volume of a unit cell having an atomic radius of $141.4 \ pm$ forming an $fcc$ unit cell.

Total volume of atoms present in a face-centred cubic unit cell of a metal is ($r$ is atomic radius)

What is the number of atoms per unit cell in a face-centered cubic $(FCC)$ crystal lattice?