what are isotopes

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Isotopes are one of two or more forms of a chemical element having the same atomic number (protons) but different mass number (neutrons).

An isotope is an element with the same amount of protons and electrons, but different amount of neutrons. One noticable example would be Carbon-12 and Carbon-14. The carbon in the periodic table is Carbon-12 becuaseit is the most common isotopeof carbon. Most elements in the periodic table are not radioactive, but their isotopes may.