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Found Isotope 2 times.

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1. Isotope
An alternate form of an element that has the usual number of proton s but a nonstandard number of neutron s; the fewer or additional neutrons give the isotope a different atomic weight than the regular element and may make the isotope radioactive , but otherwise an isotope has the same chemical action as the regular element. Because of this, isotopes (such as radioactive carbon) are used as tracers in biological systems or processes.

2. Isotopes
Atoms with the same atomic number but different numbers of neutrons ; indicated by adding the mass number to the element's name, e.g., carbon 12 or 12C.

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