Isotope

Isotopes are forms of an element whose nuclei have the same atomic number?-the number of protons in the nucleus--but different atomic masses because they contain different numbers of neutrons.

See also

• Isotope table (divided) - table of all known isotopes
• Isotope table (complete)
• List of particles
• Isotopes are nuclides having the same number of protons; compare:
• Isotones are nuclides having the same number of neutrons.
• Isobars are nuclides having the same mass number, i.e. sum of protons plus neutrons.
• Nuclear isomers are different excited states of the same type of nucleus. A transition from one isomer to another is accompanied by emission or absorption of a gamma ray, or the process of internal conversion. (Not to be confused with chemical isomers.)