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View synonyms for mass number
mass number
noun
, Physics.
- the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom. : A
mass number
noun
- the total number of neutrons and protons in the nucleus of a particular atom A Also callednucleon number
mass number
- The total number of protons and neutrons in the nucleus of an atom. For example, nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a mass number of 14. Isotopes of elements are distinguished by their mass number; for example, carbon-12 and carbon-14 have mass numbers of 12 and 14 respectively.
- Also called nucleon number
- Compare atomic mass
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Word History and Origins
Origin of mass number1
First recorded in 1920–25
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Example Sentences
There, you can donate to the cause and join the “mass number of Manson supporters worldwide.”
From The Daily Beast
In the black peaty mass Number 5, fragments of wood of the oak, yew, and fir have been recognised.
From Project Gutenberg
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