Lexic.us

Definition of Mass number

1. Noun. The sum of the number of neutrons and protons in an atomic nucleus.

Definition of Mass number

1. Noun. (physics) The total number of protons and neutrons in an atomic nucleus. ¹

¹ Source: wiktionary.com

Medical Definition of Mass number

1. The mass of the atom of a particular isotope relative to hydrogen-1 (or to 1/12 the mass of carbon-12), generally very close to the whole number represented by the sum of the protons and neutrons in the atomic nucleus of the isotope (indicated in the name or symbol of the isotope; e.g., oxygen-16, 16O); not to be confused with the atomic weight of an element, which may include a number of isotopes in natural proportion. (05 Mar 2000)

Literary usage of Mass number

Below you will find example usage of this term as found in modern and/or classical literature:

1. Journal of the American Chemical Society by American Chemical Society (1879)
"However, in almost all cases the mass number of each ion can be clearly established by simple counting. In almost all cases the chemistry of the compound ..."

2. Utilisation and Reliability of High Power Proton Accelerators: Workshop by NEA Nuclear Science Committee (2005)
"MSDM with Ignatyuk formula MSDM with Fermi-Gas 10" io 10L 0 40 80 120 160 200 mass number (A) -2 Zn 60 65 70 10 0 30 60 90 Charge Number (Z) Tm 10 10 -2 75 ..."

3. Proceedings of the Sixth Meeting of the Task Force on Shielding Aspects of by OECD Nuclear Energy Agency (2004)
"When the mass number difference between Cu and the produced nuclide is large. ... When the projectile mass number and energy increases. the reaction ..."

4. Transactions of the ... Session of the American Institute of Homœopathy by American Institute of Homeopathy Session, American Institute of Homeopathy (1908)
"<*s, MD, 321 Centre Street, Dorchester, Mass. Number of beds. ... Isaac Buscall, MD, 235 Pine Street, Springfield, Mass. Number of beds, 12; ..."

5. C.S.R. Blue Book of Dogdom (1911)
"Superintendent, TEL Kemp, 60 North Harvard Street, Allston, Mass. Number of classes, 474; number of entries, 260; number of clogs, 246. No points. ..."

6. Electricity and Magnetism by Benjamin Crowell (2002)
"... the mass of an atom mass number .......................... the number of protons plus the number of neutrons in a nucleus; approximately proportional to ..."

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