Question

How many atoms form a tetrahedral void?

Answer 1

Hint :Four spheres together form the tetrahedral void. Voids are the empty spaces between the spheres. It is found in three-dimensional structures, in the substances having a tetrahedral arrangement in their crystal. Their coordination number is four.

Complete Step By Step Answer:
Tetrahedral voids are unoccupied empty spaces present in substances having a tetrahedral crystal system. The voids are surrounded by four spheres in tetrahedral positions.
In a cubic, close-packed structure, spheres of the second layer lie above the triangular voids of the first layer. Each sphere touches the three spheres of the first layer. By joining the center of these four spheres, it forms a tetrahedron, and the space left over by joining the center of these spheres forms a tetrahedral void. In simple words, the tetrahedral void is formed when four spheres join together in \[3\] different planes and one axis.
In the crystal, the number of the tetrahedral voids is \[2n\] or twice the number of octahedral voids. The coordination number of the tetrahedral void is four. There are two tetrahedral voids per sphere in the crystal lattice. The volume of the void is much smaller than spherical particles.

Note :
The unit cells are considered to be the building block of a crystal. And it is the smallest unit of the crystal lattice. Several unit cells together make a crystal lattice. Constituent particles like atoms, molecules are also present. Each lattice point is occupied by one of these particles.