The contribution of a particle at the edge center to a particular unit cell is:

The close packing that represents the $ABC ABC......$ order is:

$A$ compound is formed by elements $X$, $Y$, and $Z$. Atoms of $Z$ (anions) make $FCC$ lattice. Atoms of $X$ (cations) occupy all the octahedral voids. Atoms of $Y$ (cations) occupy $\frac{1}{3}$ rd of the tetrahedral voids. The formula of the compound is:

Which of the following crystal lattice will have a void fraction of $0.476$?

Explain close packing in one dimension. Explain close packing in two dimensions.

What is the minimum number of spheres required to develop a tetrahedral void?