Aluminum is a pure substance that occurs naturally in various compounds. It shares similar properties with other metals, such as gallium, indium and thallium, and is classified as group 13 on the periodic table. The atomic number for aluminum is 13, which means each atom has 13 protons and 13 electrons.
Represented symbolically as "Al," aluminum's atomic weight is 26.98 atomic mass units and the density is 2.7 g/cm3. Atomic weight refers to the average mass of an element that is determined by the contribution of each isotope. The metal's melting point is 660 degrees Celsius (1,220 degrees Fahrenheit) and boiling point is 2,519 degrees C (4,566 degrees F).
Although it is spelled as "aluminum" in the United States, in other parts of the world, the metal is spelled as "aluminium."
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