MASS NUMBER (A) - Sum of the number of neutrons and protons in a nucleus.
Mass Number - A measure of the mass of a nucleus given by the total number of protons and neutrons in the nucleus
Mass-Luminosity Relation - The relationship between luminosity and mass for stars. More massive stars have greater luminosities ...
Atomic Mass Number
The total number of protons and neutrons in an atom's nucleus. For example, oxygen-16 has a mass number of sixteen, because it has eight protons and eight neutrons.
Atomic Mass Unit ...
see Atomic Mass Number. [C95]
Mass of the Galaxy
The mass has been assessed at various galactocentric distances: At R = 9 kpc, M = 1.0 × 1011 Solar masses. At R = 35 kpc, M = 4.0 × 1011 Solar masses. And, at R = 230 kpc, M = 13.
mass number A - (n.)
Nucleon number, the sum of the numbers of protons and of neutrons in the nucleus of an atom.
mass spectrometry - (n.) ...
The mass number of an element, A, is the number of nucleons (protons and neutrons) in the atomic nucleus.
G = pv p = lower case Rho mass number (NASA SP-7, 1965) The whole number nearest the value of the atomic mass of an element as expressed in atomic mass units.
As in stellar cores, the mass gap at mass number 8 is bridged in negligibly small numbers. The major uncertainties in the calculation have been in nuclear reaction rates at the relevant energies, and in the free neutron half-life tn ~900 seconds.
A nuclide is any particular atomic nucleus with a specific atomic number Z and mass number A; it is equivalently an atomic nucleus with a specific number of protons and neutrons.
Three isotopes of Lithium: the stable Lithium-6, Lithium-7 and the unstable Lithium-8, which decays via β-decay. Each of these isotopes has the same atomic number (Z=3), but a different mass number depending on the number of neutrons (3, 4 or 5).
 See also: Elements, Element, Proton, Energy, Second
  
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