isotope

Noun
  1. One of two or more atoms with the same atomic number but with different numbers of neutrons (synset 114643836)
    is a type of: atom - (physics and chemistry) the smallest component of an element having the chemical properties of the element
    subtypes:
    • radioisotope - a radioactive isotope of an element; produced either naturally or artificially
    • deuterium, heavy hydrogen - an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)

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