Mass number

Mass number

The total number of protons and neutrons in an atom or ion. In nuclide symbols the mass number is given as a leading superscript. In isotope names (e.g. carbon-14, sodium-23) the mass number is the number following the element name.

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Category: General chemistry
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Related terms

mass number

Energy; Nuclear energy

The number of nucleons (neutrons and protons) in the nucleus of an atom. Also known as the atomic weight.

mass number

Chemistry; General chemistry

The total number of protons and neutrons in the nucleus of an atom. Nitrogen has a mass number of 14(7 neutrons and 7 protons).

mass number

Physics; General physics

The sum of the number of protons and neutrons in a nucleus.

mass number

Geography; Physical geography

Total number of neutrons and protons in the nucleus of an atom. Approximate measure of the mass of an atom. Also see atomic number.

mass number

Science; General science

The mass number A of an atom is the total number of its nuclear constituents, or nucleons, as the protons and neutrons are collectively called. The mass number is placed before ...

mass number

Chemistry; General chemistry

The total number of protons and neutrons in an atom or ion. In nuclide symbols the mass number is given as a leading superscript. In isotope names (e.g. carbon-14, sodium-23) ...