weight of one atom of a particular element (one unit of weight is equal to 1/12 of the weight of a carbon-12 atom)
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Atomic weight Definition from Language, Idioms & Slang Dictionaries & Glossaries
atomic weight
n : (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12 [syn: relative atomic mass ]
Noun
1. (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12
(synonym) relative atomic mass
(hypernym) mass
(hyponym) equivalent, equivalent weight, combining weight, eq
(classification) chemistry, chemical science
Atomic weight Definition from Business & Finance Dictionaries & Glossaries
the average, relative weight of an element as compared to another element taken as a standard. Usually carbon, with a weight of 12, is used as the basis. Every element is assigned an atomic weight.
Atomic weight Definition from Science & Technology Dictionaries & Glossaries
The average relative weight of a chemical element as it occurs in nature referred to some element taken as a standard.
The weight of an elementary atom, in relation to the weight of an atom of hydrogen. A hydrogen atom being taken as 1.00g.
Atomic weight Definition from Computer & Internet Dictionaries & Glossaries
the weight of an atom of a specific element where one atomic weight unit is defined as the weight of 1/12 of a carbon 12 Atom.
Copyright © 2000 - 2006 IC Knowledge LLC. All rights reserved.Atomic weight Definition from Encyclopedia Dictionaries & Glossaries
Atomic weight (symbol: A) is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a given source) to 1/12 of the mass of an atom of carbon-12 (known as the unified atomic mass unit). The term is usually used, without further qualification, to refer to the standard atomic weights published at regular intervals by the International Union of Pure and Applied Chemistry (IUPAC) and which are intended to be applicable to normal laboratory materials. These standard atomic weights are reprinted in a wide variety of textbooks, commercial catalogues, wallcharts etc., and in the table below.
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Atomic weight Definition from Society & Culture Dictionaries & Glossaries
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 isotope of carbon (taken as precisely 12.000), that is the official international standard; measured in daltons.
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Atomic weight Definition from Medicine Dictionaries & Glossaries
the mass of an atom, expressed in atomic mass units. For example, the atomic number of helium-4 is 2, the atomic mass is 4, and the atomic weight is 4.00026.
Source: Centers for Disease Control and Prevention (CDC) ( About )