Identify that metals have crystal lattice structure

http://hsc.csu.edu.au/physics/core/implementation/9_4_4/944net.html#net2

· The atoms in a crystal are in a regular repeating pattern called the crystal lattice.
· A crystal lattice is defined by a repeated three-dimensional unit.
· The basic building block of these crystalline structures is known as the “unit cell” and this “unit cell” repeats itself over and over to form a lattice.
· When a pure metal starts to form from a cooling molten state, the atoms arrange themselves in an ordered geometrical pattern that is repeated over and over again producing a crystalline structure....