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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

atomic weight

n
(Chemistry) the former name for relative atomic massAbbreviation: at wt
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

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.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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References in periodicals archive ?
BCSEA, in-charge of conducting exams in high schools in Bhutan, made a critical change to class X Chemistry paper starting this year where students were no longer given atomic weight table during the exam.
Table 1 showed the element composition of all the concrete samples obtained from the x-ray micro analysis, it can be observed from the table that the amount of Oxygen (O) is more than any other element in all the samples; this is because it is the dominant element in concrete, both it mass and atomic percentage reduces as the amount of rubber crumb increases in the concrete, the magnesium (Mg) also reduces in mass and atomic weight as rubber crumb increases, the same condition applied to silicon (Si), with the exception of sample [C.sub.12] which has higher proportion of silicon in it.
Our words have no heavenly atomic weight of creation; they brush against a facet of meaning only.
the same as its atomic weight (AW, 14.0067) and exactly twice its AN (7).
Strontium has a greater atomic weight than calcium: "...
Heavy metals are elements having atomic weight from 63.54 to 200.59, and a specific gravity greater than 4.
Element Weight % [W.sub.i] Z [A.sub.w] BK 26.24 0.2623 5 10.811 OK 61.51 0.6151 8 15.999 KK 12.25 0.1225 19 39.098 Total 100 1.0 36.546 [A.sub.w]: the atomic weight, Z: the atomic number of the element, and [W.sub.i]: the fractional weight.
The quantity [w.sub.i] is given by [w.sub.i] = [n.sub.i][A.sub.i]/[[summation].sup.n.sub.j][n.sub.j][A.sub.j] with condition [[summation].sup.n.sub.i][w.sub.i] = 1, where [A.sub.i] is the atomic weight of the ith element and [n.sub.i] is the number of formula units in the compounds.
Since the muon angular trajectory changes as a function of the density and atomic weight of the material traversed, a unique "signature" for the substance can be developed.
"We thought long and hard about whether to keep the name Iridium, because that really represented the previous company, in that iridium has an atomic weight of 77, and there were originally 77 satellites," Desch says.
First, we've thought of facts as being the primitives of knowledge, the simple atoms out of which all knowledge is constructed: The atomic weight of helium is 4.003.
Its atomic number, atomic weight, and mass volume are 90, 232, and 11.7 gram/cubic centimeter, respectively.