The unit cell, or building block of a crystal, is the smallest repeating unit in the crystal lattice.
It can be of different types: primitive cubic, body-centered cubic (BCC), or face-centered cubic unit cell.
Primitive Cubic Unit Cell
Only the corners of the primitive cubic unit cell have atoms, and each atom at the corner is shared by eight adjacent unit cells.
The simple cubic (SC) unit cell can be described as a cube with an atom on each corner.
Thus, each small sphere represents the center of a particle that occupies that particular position, not its size, and each unit cell has the only part of an atom.
The number of atoms will be 1.
Example of simple cubic unit cell is Polonium metal.
