How to Deal with Solid State Numerical Problems - Part 1

Interstitial sites/holes/voids in crystallography are the empty space that exists between the close-packing of atoms (typically considered as spheres) in the crystal structure.


Close-packing of spheres in geometry is a dense, infinite, regular arrangement of congruent, identical spheres in an arrangement (aka lattice).

Question:

Atoms of element B form hcp lattice and those of the element A occupy 2/3rd of tetrahedral voids. What is the formula of the compound formed by the elements A & B? 

Solution:



Click to enlarge the image

How is it❓ Let Chemaficionado know at mychemistryhomework@gmail.com❗

References:

(1)    Wikipedia Contributors. Close-packing of equal spheres. Wikipedia. https://en.wikipedia.org/wiki/Close-packing_of_equal_spheres.

(2)    Wikipedia Contributors. Interstitial site. Wikipedia.

(3)    Ncert. Chemistry : Textbook for Class XI - Part.I; National Council Of Educational Research And Training: New Delhi.

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