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'''Chemical formulas''' are a type of shorthand utilizing symbols and numbers to indicate the composition of a compound and the number of atoms of an element in one molecule of the substance. Each element has a symbol listed on the periodic table of elements, which generally is an abbreviation of its name, (i.e. Al for Aluminum) but sometimes these symbols are derived from Latin words (i.e. Au for Gold.) Chemical formulas for molecules composed of only one type of element can be either '''monatomic''' or '''diatomic.''' Monatomic molecules consist of a single atom. The only monatomic molecules are those formed by the noble gases (the elements in the last column of the periodic table, helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and radon (Rn).
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