Aluminum belongs to the Boron family, which is group number 13 on the periodic table of elements. The other elements in the Boron family are the metals thallium, indium, gallium and the semi-metal boron. The element aluminum is a solid metal at room temperature that is assigned the period number 3 and atomic number 13 on the periodic table of elements.
Aluminum is the most plentiful metal element found in the earth's crust at 8.2 percent, but does not occur freely in nature. All aluminum on Earth has merged with other elements to form compounds, with the two most common being aluminum oxide and aluminum sulfate. Aluminum alloys and other forms of aluminum are used to manufacture items, such as foils, utensils, cans and components for rockets, lasers and airplanes.