Definition of mass number
: an integer that approximates the mass of an isotope and designates the number of nucleons in the nucleus
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First Known Use of mass number
1923
Medical Dictionary
mass number
medical Definition of mass number
: an integer that approximates the mass of an isotope and that designates the number of nucleons in the nucleus
- the symbol for carbon of mass number 14 is 14C or C14
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Britannica.com: Encyclopedia article about mass number
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