$A$ solid $AB$ has a $ZnS$ type structure. If the radius of the $B^-$ ion is $100 \, pm$, what is the minimum radius of the $A^+$ cation in $pm$?

In a face-centered cubic arrangement of atoms $A$ and $B$,atoms $A$ are at the corners of the unit cell and atoms $B$ are at the face centers. If one atom $A$ is missing from one corner of the unit cell,what is the simplest formula of the compound?

If a metal has a $fcc$ crystal structure,the coordination number is $12$ because

Explain the calculation of the number of atoms in a body-centered cubic $(bcc)$ unit cell.

The coordination number of a metal crystallizing in a hexagonal close-packed $(hcp)$ structure is:

In a simple cubic unit cell,how many unit cells share each lattice point located at the corner?