Question

An element from a simple cubic unit cell. If the radius of an atom of the element is 1.53 Å calculate the internuclear distance between neighbouring atoms in the unit cell​

Answer 1

In a simple cubic lattice, two atoms touch each other along the edge of a cube.

Hence, the distance between the centres of the nuclei of two adjacent atoms is equal to the edge length of the cell which is a.

Hence, the nearest neighbour distance in a simple cubic lattice is a.