Definitions for mass number
mass num·ber

Princeton's WordNetRate this definition:1.0 / 1 vote

1. mass number, nucleon numbernoun

   the sum of the number of neutrons and protons in an atomic nucleus

WiktionaryRate this definition:0.0 / 0 votes

1. mass numbernoun

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

WikipediaRate this definition:0.0 / 0 votes

1. Mass number

   The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) mass of the atom expressed in atomic mass units. Since protons and neutrons are both baryons, the mass number A is identical with the baryon number B of the nucleus (and also of the whole atom or ion). The mass number is different for each isotope of a given chemical element, and the difference between the mass number and the atomic number Z gives the number of neutrons (N) in the nucleus: N = A − Z.The mass number is written either after the element name or as a superscript to the left of an element's symbol. For example, the most common isotope of carbon is carbon-12, or 12C, which has 6 protons and 6 neutrons. The full isotope symbol would also have the atomic number (Z) as a subscript to the left of the element symbol directly below the mass number: 126C.

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1. mass number

   The mass number is the total number of protons and neutrons present in the nucleus of an atom. It is an integer value and signifies the atomic mass of a specific isotope of an element.

WikidataRate this definition:0.0 / 0 votes

1. 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. The mass number is written either after the element name or as a superscript to the left of an element's symbol. For example, the most common isotope of carbon is carbon-12, or 12C, which has 6 protons and 6 neutrons. The full isotope symbol would also have the atomic number as a subscript to the left of the element symbol directly below the mass number: 12 6C. This is technically redundant, as each element is defined by its atomic number, so it is often omitted.

Matched Categories

1. • Mass Unit

How to pronounce mass number?

1. Alex

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   David

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   Mark

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   Daniel

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   Libby

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   Mia

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   Karen

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How to say mass number in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of mass number in Chaldean Numerology is: 8

2. Pythagorean Numerology

   The numerical value of mass number in Pythagorean Numerology is: 8

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=mass number
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Mass_Number
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Mass_Number
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=mass number