In a body-centered cubic $(BCC)$ unit cell,the atom at the body center is shared by how many unit cells?

Which type of cubic lattice has the maximum number of atoms per unit cell?

$A$ cubic solid is made of two elements $P$ and $Q$. Atoms of $Q$ are at the corners of the cube and $P$ at the body-centre. What is the formula of the compound? What are the coordination numbers of $P$ and $Q$?

The number of atoms contained in one face-centred cubic $(FCC)$ unit cell of a monoatomic substance is:

The number of octahedral voids in a $BCC$ structure is:

What is the coordination number in a calcium fluoride $(CaF_2)$ type structure?