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WordNet-Online
Definitions from WordNet
Noun mass number has 1 sense
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Definitions from the WebMass NumberNoun (Chemistry) The mass number, also known as atomic mass number or nucleon number, is the total number of protons and neutrons in an atom's nucleus. Example sentence: The mass number of carbon-12 is 12, indicating that it contains six protons and six neutrons. Noun (Physics) In physics, mass number refers to the total number of nucleons in an atomic nucleus, including both protons and neutrons. Example sentence: The mass number of an isotope determines its stability and properties in nuclear reactions. Noun (Astronomy) When referring to stars, mass number is the total number of nucleons in the star's core or the total mass of all the atoms combined. Example sentence: The study suggests that the mass number of the observed star is approximately 2.5 times that of the Sun. Related products on Amazon: | ||||
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