If the edge length of a cubic unit cell in an $fcc$ structure is $620 \ pm$, then the atomic radius of the element will be ............... $pm$.

The crystal $AB$ has a structure similar to $NaCl$. Atoms of $A$ are present at each corner of the cubic unit cell. If all atoms along one of the axes passing through the face centers are removed,what will be the resulting stoichiometry?

What is the coordination number of $Cu$ in a face-centered cubic $(fcc)$ lattice?

Copper crystallizes in $f.c.c.$ with a unit cell length of $361 \ pm$. What is the radius of copper atom? (in $pm$)

For an ionic crystal of the general formula $AX$ and coordination number $6$,the value of radius ratio will be

Which of the following is a $1:2$ type compound?