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Isotopes of an element have the same number of protons and electrons, but different numbers of neutrons. Any element is made up of a combination of isotopes.

For example if you are looking at carbon, there is carbon-12 and carbon-13, which are stable, and carbon-14 which is radioactive. This is true for many elements, and the Atomic Mass, the one displayed on the Periodic Table, is an average of the masses of all of the isotopes. But the atomic number of all isotopes is the same.

http://www.chem4kids.com/files/atom_isotopes.html

http://www.Colorado.edu/physics/2000/isotopes/index.html

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