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What is relative mass?

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Relative mass is the average mass of a large number of atoms of a particular element on the periodic table. It is typically shown on the bottom of each element's box on the periodic table.

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The mass of an individual atom is the sum of its protons and neutrons, as electrons have insignificant mass. Elements in chemistry have relative mass because a subset of atoms corresponding to each element are isotopes. These are atoms of the element with the same number of protons but a higher number of neutrons. Relative mass is affected by the abundance of the isotope in each element.

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