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

The sum of the number of first and second nearest neighbors in an $FCC$ closed packing is:

An example of fluorite structure is

An ionic compound has unit cells consisting of $A$ ions at the corners of a cube and $B$ ions on the centres of the faces of the cube. The empirical formula of this compound is

$Pt$ has an $FCC$ structure with an edge length of unit cell $392 \text{ pm}$. What is the radius of $Pt$ (in $\text{ pm}$)?

In a face-centered cubic $(FCC)$ unit cell,how many unit cells share an atom located at the face center?