atomic weight


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Related to atomic weight: molecular weight

atomic weight

n.
The average mass of an atom of an element, usually expressed relative to the mass of carbon 12, which is assigned 12 atomic mass units.

atomic weight

n
(Chemistry) the former name for relative atomic massAbbreviation: at wt

atom′ic weight′


n.
the average weight of an atom of an element, based on 1/12 the weight of the carbon-12 atom. Abbr.: at. wt.

atomic weight

The average mass of a chemical element, expressed in atomic mass units. The atomic weight of an element having more than one principal isotope is calculated both from the atomic masses of the isotopes and from the relative abundance of each isotope in nature. For example, the atomic weight of the element chlorine is 35.453, determined by averaging the atomic masses and relative abundances of its two main naturally occurring isotopes, which have atomic masses of about 35 and 37. Compare atomic mass.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.atomic weight - (chemistry) the mass of an atom of a chemical element expressed in atomic mass unitsatomic weight - (chemistry) the mass of an atom of a chemical element expressed in atomic mass units
mass - the property of a body that causes it to have weight in a gravitational field
combining weight, eq, equivalent weight, equivalent - the atomic weight of an element that has the same combining capacity as a given weight of another element; the standard is 8 for oxygen
meq, milliequivalent - one-thousandth of an equivalent
chemical science, chemistry - the science of matter; the branch of the natural sciences dealing with the composition of substances and their properties and reactions
Translations
References in periodicals archive ?
The history of weighing from biblical times to the implementation of the metric system is recounted with special emphasis on the origin of atomic weights
You know, Iridium has an atomic weight of 77," Richardson of Alaska Raft Connection says.
Named for medium atomic weight elements (though neither are actually elements), timedetectives Sapphire (Joanna Lumley) and Steel (David McCallum) materialised out of the ether to repair breaks in the fabric of time in order to save the world from alien intervention.
In this example, however, the relevant assumptions, like the unreliability of accepted measures of atomic weight and a systematic unity to the elements, were readily identifiable.
Lead is soft, silver-colored, with an atomic weight of H 82 and denoted with the symbol Pb, from the Latin plumbum, as in plumbing.
Think about it: they're talking about taking out a quarter of a ton and they're working with things in the scale of atomic weight: the atomic weight of aluminum, for example, is 26.
And yes, oxygen as an element supports life and combustion, has an atomic number of 8, an atomic weight of 16 and a molecular weight of 32.
However, radioactive decay is entirely different: there is no distribution of atomic weight of the decaying nucleus.
Sodium may conjure vague images to the mind of a layman, but for a chemist it is the specific name of an element represented by a symbol (Na), defined by its atomic weight (22.
In 1911 Marie Curie was awarded the Nobel Prize in Chemistry for producing a pure metal sample of radium and establishing the atomic weight of radium and polonium.