mass number

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Related to Atomic mass number: Isotopes

mass number

n.
The sum of the number of neutrons and protons in an atomic nucleus. Also called nucleon number.

mass number

n
(Atomic Physics) the total number of neutrons and protons in the nucleus of a particular atom. Symbol: A Also called: nucleon number

mass′ num`ber


n.
the number of nucleons in an atomic or isotopic nucleus. Symbol: A
[1920–25]

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.

mass number

1. The total number of protons and neutrons (nucleons) in the nucleus of an atom.
2. The number of nucleons (protons and neutrons) in the nucleus of an atom.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.mass number - the sum of the number of neutrons and protons in an atomic nucleusmass number - the sum of the number of neutrons and protons in an atomic nucleus
mass unit - a unit of measurement for mass
Translations

mass number

n (Phys) → numero di massa
References in periodicals archive ?
While the right panel of Figure 3 only shows the resulting plot, the EJS simulation contains a panel with which the user can change the atomic mass number and mass in order to analyze the orbitals of other atoms.