What is the meaning of mass number?

noun

  • The sum of the number of neutrons and protons in an atomic nucleus.
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). mass number. Retrieved September 20, 2026, from http://smartdefine.org/mass_number/definitions/1244342
ChicagoWordNet. 2010. "mass number" http://smartdefine.org/mass_number/definitions/1244342 (accessed September 20, 2026).
HarvardWordNet 2010, mass number, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/mass_number/definitions/1244342>.
MLAWordNet. "mass number" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/mass_number/definitions/1244342>