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*The atoms of a given element are often a mixture of different isotopes, that is, elements with different numbers of neutrons. The agreed-upon atomic mass of an element is the average of the masses of its isotopes, weighted by their observed abundance on [[Earth]].
*The atoms of a given element are often a mixture of different isotopes, that is, elements with different numbers of neutrons. The agreed-upon atomic mass of an element is the average of the masses of its isotopes, weighted by their observed abundance on [[Earth]].
*The mass of a nucleus is not precisely the sum of the masses of its constituents, because of the binding energy and the relation E=mc<sup>2</sup>.
*The mass of a nucleus is not precisely the sum of the masses of its constituents, because of the binding energy and the relation E=mc<sup>2</sup>.
*The atomic mass also takes into account the mass of the [[electron]]s circling the nucleus. While the electrons weigh only about 1/2000<sup>th</sup> as much as the protons, this makes a difference. Atomic mass is not the same as nuclear mass.
*The atomic mass also takes into account the mass of the [[electron]]s circling the nucleus. While the electrons weigh only about 1/2000th as much as the protons, this makes a difference. Atomic mass is not the same as nuclear mass.
An element's atomic mass is found below its symbol on the [[periodic table of the elements]].
An element's atomic mass is found below its symbol on the [[periodic table of the elements]].