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View synonyms for

mass number

noun

Physics.
  1. the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. : A

mass number

noun

  1. the total number of neutrons and protons in the nucleus of a particular atom A Also callednucleon number
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

mass number

  1. 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.
  2. Also called nucleon number
  3. Compare atomic mass
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Word History and Origins

Origin of mass number1

First recorded in 1920–25
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