Aluminum

Aluminum is the metallic chemical element of atomic number 13. Its symbol is Al, its atomic weight is 26.98, its specific gravity is 2.70, its melting point is 1,220.5°F (660°C), and its boiling point is 4,566.2°F (2,519°C).

Aluminum is a metal in group 13 of the periodic table. Its atoms consist of a single stable isotope, ²⁷Al. Known as aluminium in other English-speaking countries, it was named after alum, one of its salts that has been known for thousands of years and was used by the Egyptians, Greeks, and Romans as a mordant—a chemical that helps dyes stick to cloth.