MASSNUMBER

Mass number

The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. Because protons and neutrons both are baryons, the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion. The mass number is different for each different isotope of a chemical element. This is not the same as the atomic number which denotes the number of protons in a nucleus, and thus uniquely identifies an element. Hence, the difference between the mass number and the atomic number gives the number of neutrons in a given nucleus: N=A−Z.

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mass number

Noun

  1. The total number of protons and neutrons in an atomic nucleus.


The above text is a snippet from Wiktionary: mass number
and as such is available under the Creative Commons Attribution/Share-Alike License.

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