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There are 12 summaries on Atomic mass.
Encyclopedia and Summary Information
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 Atomic Mass and Weight Summary
988 words, approx. 3 pages
 The atomic mass of an atom (i.e., a specific isotope of an element) is measured in comparison with the mass of one atom of carbon-12 (12C) that is assigned a mass of 12 atomic mass units (amu). Atomic mass is sometimes erroneously confused with atomic... summary from source:
 Atomic Weight/Mass Summary
719 words, approx. 2 pages
The atomic mass of an element is the mass of the number of particles in its nucleus given in atomic mass units. Although it is sometimes referred to as atomic weight, this is inaccurate, since weight is a measurement that includes the effect of g... summary from source:
 Atomic Weight/Mass Summary
713 words, approx. 2 pages
The atomic mass of an element is the mass of the number of particles in its nucleus given in atomic mass units. Although it is sometimes referred to as atomic weight, this is inaccurate, since weight is a measurement that includes the effect of... summary from source:
 Atomic Weight Summary
130 words, approx. 0 pages
Ratio of the average mass of a chemical element's atoms to 112 the mass of an atom of the carbon-12 isotope. The original standard of atomic weight, established in the 19th century, was hydrogen, with a value of 1. From &circa; 1900 until 1961, the... summary from source:
 Atomic Weight Summary
102 words, approx. 0 pages
The average weight (or mass) of all the isotopes of an element, as determined from the proportions in which they are present in a given element, compared with the mass of the 12 isotopes of carbon (taken as precisely 12,000), which is the official... summary from source:
Atomic Weight Summary
73 words, approx. 0 pages
Literally this is the weight of an ATOM. It is more or less equivalent to the combined weight of the protons and neutrons in an atom (that is, the atomic NUCLEUS) since electrons have next to no mass. The atomic weight alone is rarely of interest to... summary from source:
Formula Weight Summary
70 words, approx. 0 pages
Sum of the atomic weights of all atoms in a chemical formula. The term is generally applied to a substance that consists of ions (&see; ionic bond) rather than individual molecules (and thus does not have a molecular weight). An example of such a... summary from source:
Atomic Mass Summary
36 words, approx. 0 pages
Mass of an ELEMENT expressed in units that are themselves defined as being one-twelfth that of the mass of an ATOM of carbon-12. The atomic mass is also sometimes known as the atomic... summary from source:
Formula Weight Summary
25 words, approx. 0 pages
(FW) The weight of a substance without the WATER OF CRYSTALLIZATION; the formula weight plus the water of crystallization gives the MOLECULAR... summary from source:
summary from source:
summary from source:
 Atomic mass Summary
1,926 words, approx. 6 pages
The atomic mass (ma) is the mass of an atom at rest, most often expressed in unified atomic mass units.[1] The atomic mass may be considered to be the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless). The... 
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