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mass number
(redirected from mass numbers)

    Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.07 sec.
mass number
n.
The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number.
mass number
Noun
the total number of protons and neutrons in the nucleus of an atom
mass number
The total number of protons and neutrons in the nucleus of an atom. For example, nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a mass number of 14. Isotopes of elements are distinguished by their mass number; for example, carbon-12 and carbon-14 have mass numbers of 12 and 14 respectively. Also called nucleon number. Compare atomic massatomic weight
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.mass number - the sum of the number of neutrons and protons in an atomic nucleus
nucleon number
mass unit - a unit of measurement for mass
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