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What is the mass number
Chemistry question: What is the mass number? A mass number is
the total number of protons and neutrons found in an atom
mass number
n
(Physics / Atomic Physics) the total number of neutrons and protons in the
nucleus of a particular atom. Symbol A Also called nucleon
number
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
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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