How many atoms are there in a cubic unit cell having one atom on each corner and two atoms on each body diagonal of a cube?

In a compound formed by $A^{+}$ and $B^{-}$ ions,$B^{-}$ ions are arranged at all corners except two and at all face centers except three,while $A^{+}$ ions are at the midpoints of all body diagonals. The molecular formula of the compound will be ................

$A$ solid compound contains atoms $X, Y,$ and $Z$. In its unit cell,atoms $X$ are at the corners,atoms $Y$ are at the body center,and atoms $Z$ are at the face centers. The formula of the compound is:

In the fluorite structure,the coordination number of the $Ca^{2+}$ ion is.....

What is the coordination number of each atom in a $bcc$ structure?

What is the total volume occupied by atoms in a face-centered cubic $(FCC)$ unit cell of a metal?