Question

Statement-1 : In close packing of spheres, a tetrahedral void
is surrounded by four spheres whereas an octahedral void
is surrounded by six spheres.
Statement-2 : A tetrahedral void has a tetrahedral shape
whereas an octahedral void has an octahedral shape.

Answer 1

Tetrahedral void is so called because it is surrounded by four spheres tetrahedrally while octahedral void is so called because it is surrounded by six spheres octahedrally.

Explanation:

• When one sphere is placed inside the depression formed by three spheres then a tetrahedral void is formed.  
• A void is a vacant space in the crystal lattice where 44 constituent particles having a tetrahedral arrangement are present.
• When the equilateral triangle arrange themselves as 33 closely packed structures then the octahedral void is formed.

• The structure formed covers another set of three spheres in opposite directions.

Thus we can say that, Tetrahedral void is so called because it is surrounded by four spheres tetrahedrally while octahedral void is so called because it is surrounded by six spheres octahedrally.

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