- average atomic mass
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The weighted average of the atomic masses of the naturally occurring isotopes of an element.
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average atomic mass
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Atomic mass — The atomic mass (ma) is the mass of an atom, most often expressed in unified atomic mass units. [GoldBookRef|file=A00496|title=atomic mass] The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom … Wikipedia
atomic mass — /əˌtɒmɪk ˈmæs/ (say uh.tomik mas) noun the actual average mass of an atom of an element, measured in atomic mass units. Compare relative atomic mass …
relative atomic mass — noun (chemistry) the mass of an atom of a chemical element expressed in atomic mass units • Syn: ↑atomic mass, ↑atomic weight • Topics: ↑chemistry, ↑chemical science • Hypernyms: ↑m … Useful english dictionary
relative atomic mass — noun the average mass of the atoms of an element in its naturally occurring state, relative to the mass of an atom of the carbon 12 isotope taken as exactly 12. Compare atomic mass. Also, atomic weight …
relative atomic mass — (ram) Mass of atoms of an element formerly in atomic weight units but now more correctly given on the unified scale where 1 u is 1.660 x 10 27kg, where u is the atomic mass unit. For natural elements with more than one isotope, it is the average… … Dictionary of automotive terms
relative atomic mass — ► NOUN ▪ the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon 12 … English terms dictionary
atomic mass — noun a) The mass of an atom. b) atomic weight; the average mass of atoms of an element … Wiktionary
relative atomic mass — noun Chemistry the ratio of the average mass of one atom of an element to one twelfth of the mass of an atom of carbon 12 … English new terms dictionary
Mass number — The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. Because protons and neutrons both are baryons, the mass number A is identical… … Wikipedia
Atomic number — See also: List of elements by atomic number An explanation of the superscripts and subscripts seen in atomic number notation. In chemistry and physics, the atomic number (also known as the proton number) is the number of protons found in the… … Wikipedia
