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Relative atomic mass (RAM)
The mean mass of an atom relative to the mass of 1/12th of an atom of carbon-12, which is assigned a mass of 12. The Ar of an element is the mean relative mass of the isotopes in the element.
Ar
Symbol for relative atomic mass (RAM).
Isotopes
Atoms of an element with the same number of protons (atomic number) but different mass numbers due to different numbers of neutrons.
Mean
An average calculated by adding up the values of a set of measurements and dividing by the number of measurements in the set.
Nuclear fission
The reaction in which the nucleus of a large atom, such as uranium, splits into two smaller nuclei.
