| mass number |
the sum of the number of neutrons and protons in an atomic nucleus
출처: wordnet.princeton.edu/perl/webwn
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| mass number |
The mass number (A), also called atomic mass number or nucleon number, is the number of protons and neutrons in an atomic nucleus. The mass number is unique for each isotope of an element and is written either after the element name or as a superscript to the left of an element's symbol. For example, carbon-12 (12C) 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: . ...
출처: en.wikipedia.org/wiki/Mass_number
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| mass number |
the sum of the protons and neutrons that make up that nucleus (or sum of nucleons)
출처: www.sciencebyjones.com/definitions.htm
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| mass number |
The number of particles within the nucleus of an atom (the sum of the protons and neutrons). This varies depending on both the element and the isotope.
출처: users.aber.ac.uk/ret3/definitions.htm
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