Gallium is a metal with a remarkably low melting point of 29.8∘C29.8^\circ\text{C}29.8∘C. When a sample of liquid gallium at 40∘C40^\circ\text{C}40∘C is allowed to cool to room temperature, it solidifies into a shiny crystalline solid.
Describe how the arrangement and movement of the gallium atoms change as the liquid solidifies.
