Question:
How will you distinguish between the following pairs of terms?
Solution:
- A void surrounded by four spheres occupying the corners of a tetrahedron is called a tetrahedral void. It is much smaller than the size of a sphere in the close packing. A void surrounded by six spheres along the corners of an octahedron is called an octahedral void. The size of the octahedral void is smaller than that of the spheres in the close packing but larger than the tetrahedral void.
- The regular three-dimensional arrangement of identical points in space which represent how the constituent particles are arranged in a crystal is called a crystal lattice. A unit cell is the smallest portion of a crystal lattice, which when repeated over and again in different directions produces the complete crystal lattice.
