* An element's average atomic mass is calculated by adding the masses of its isotopes and multiplying each by the element's natural abundance.* Average atomic mass is equal to f

_{1}M

_{1}+ f

_{2}M

_{2}+… + f

_{n}M

_{n}, where f is the fraction indicating the isotope's natural abundance and M is its mass number (weight). On the periodic table, an

**element's average atomic mass**is usually listed beneath the elemental symbol.

**Calculating the average atomic mass of an element**is simple when information on the natural abundance of the various isotopes of that element is available. If you are struggling with

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