What is the average atomic mass of an element?

The average atomic mass of an element is the mass found on the periodic table under the element symbol.  It is called the average atomic mass because it is actually a calculated sum of the masses of the element's isotopes (same element with different number of neutrons), each multiplied by their natural abundances.

The average atomic mess of an element is the sum of masses of its isotopes, each multiplied by its natural abundance .

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