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Definition: Atomic Weight |
Atomic WeightNoun1. (chemistry) the ratio of the atomic mass of an element to half the atomic mass of carbon-12. Source: WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved. |
| Domain | Definition |
Aerospace | The weight of an atom according to a scale of atomic weight units, awu, valued as one-twelfth the mass of the carbon atom (C12 = 12.00000). See Table IV.Thus expressed, the atomic weight to the nearest integer is identical with the mass number.Abbreviation at. wt. (references) |
Literature | Atomic Weight The weight of an atom of an element, compared with an atom of hydrogen, the standard of unity. Source: Brewer's Dictionary. |
Mining | The average relative weight of the atoms of an element referred to an arbitrary standard of 16.0000 for the atomic weight of oxygen. The atomic weight scale used by chemists takes 16.0000 as the average atomic weight of oxygen atoms as they occur in nature. The scale used by physicists takes 16.00435 as the atomic weight of the most abundant oxygen isotope. Division by the factor 1.000272 converts an atomic weight on the physicists' scale to the corresponding atomic weight on the chemists'scale. See also:atomic number. (references) |
Physics | The average weight of one atom of a given element, measured on a scale on which the weight of one atom of the carbon isotope C12/6 is taken to be 12. Source: European Union. (references) |
Weather | 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. (references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
The atomic weight (or, more accurately, the atomic mass) of an isotope of a chemical element is the mass of one atom of that isotope, expressed in units (atomic mass unit, amu) such that the Carbon-12 isotope receives atomic weight 12. The atomic weight of a chemical element is defined as the average atomic weight of its isotopes. The average is taken according to the relative frequencies of the element's isotopes.
A similar definition applies to molecules; it is then called molecular mass. It turns out that one can compute the molecular mass of a compound by adding the atomic masses of its constituent atoms, counted with the proper multiplicities.
Various experiments allow to compare masses of atoms or molecules, and atomic and molecular weights can therefore be determined rather easily.
One mole of a substance always weighs exactly the atomic or molecular weight of that substance, expressed in grams. For example, the atomic weight of iron is 55.847, and therefore one mole of iron atoms weighs 55.847 grams.
Formerly chemists and physicists used two different atomic weight scales. The chemists used a scale such that the natural mixture of oxygen isotopes had an atomic weight 16, while the physicists assigned the same number 16 to the atomic weight of the most common oxygen isotope (containing eight protons and eight neutrons). The unified scale based on C12 met the physicists' need to base the scale on a pure isotope, while being numerically close to the old chemists' scale.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Atomic weight."
Synonym: Atomic WeightSynonym: relative atomic mass (n). (additional references) |
Crosswords: Atomic Weight |
| English words defined with "atomic weight": Atomic heat ♦ Combining weight ♦ Davyum ♦ eq, equivalent, equivalent weight ♦ Glucinum, gram atom, gram-atomic weight ♦ light ♦ Standardized solution. (references) |
| Specialty definitions using "atomic weight": Atomic Volume, atomic weight unit ♦ Calcium Isotopes, Carbon Isotopes, Cerium Isotopes, Cesium Isotopes, chlorinity, Chromium Isotopes, Cobalt Isotopes ♦ Gallium Isotopes, Gold Isotopes, gram-atom, gramme atome ♦ Iodine Isotopes, Iron Isotopes ♦ Mercury Isotopes ♦ Nitrogen Isotopes, nuclide ♦ Oxygen Isotopes ♦ Phosphorus Isotopes, Potassium Isotopes ♦ Radionuclide ♦ Sodium Isotopes, Strontium Isotopes, Sulfur Isotopes ♦ Xenon Isotopes ♦ Yttrium Isotopes ♦ Zinc Isotopes. (references) |
| Domain | Usage | |
Screenplays | Is the atomic weight of cobalt 58.9? (Ghostbusters II; writing credit: Dan Aykroyd; Harold Ramis) | |
Source: compiled by the editor from various references; see credits. | ||
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Source: compiled by the editor from various references; see credits. | |
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Health | It has an atomic symbol K, atomic number 19, and atomic weight 39.10. It is the chief cation in the intracellular fluid of muscle and other cells. (references) | |
Source: compiled by the editor from ICON Group International, Inc.; see credits. | ||
| Hypenated Usage | |
Ending with "atomic weight": gram-atomic weight. | |
| Source: compiled by the editor from various references; see credits. | |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day |
atomic weight | 30 |
| Source: compiled by the editor from various references; see credits. | |
| Language | Translations for "atomic weight"; alternative meanings/domain in parentheses. | ||||||||||||||||||||||||||||||||||
Afrikaans | atoomgewig. (various references) | ||||||||||||||||||||||||||||||||||
Arabic | الوزن الذري. (various references) | ||||||||||||||||||||||||||||||||||
Danish | atomvaegt (at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
Dutch | atoomgewicht (at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
Esperanto | atompezo. (various references) | ||||||||||||||||||||||||||||||||||
Finnish | atomipaino (at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
French | poids atomique (at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
German | atomgewicht (A.W., at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
Greek | Ατομικό βάρος (at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
Hungarian | atomsúly. (various references) | ||||||||||||||||||||||||||||||||||
Italian | peso atomico (at.wt.). (various references) | ||||||||||||||||||||||||||||||||||
Japanese Kanji | 原子量 . (various references) | ||||||||||||||||||||||||||||||||||
Japanese Katakana | '"しりょう. (various references) | ||||||||||||||||||||||||||||||||||
Manx | trimmid breneenagh. (various references) | ||||||||||||||||||||||||||||||||||
Pig Latin | atomicay eightway peso atomico (at.wt.), peso atômico, massa atômica. (various references) атомный вес. (various references) peso atómico (at.wt.). (various references) atomvikt (at.wt.). (various references) atom ağırlığı. (various references) | ||||||||||||||||||||||||||||||||||
Misspellings | |
"Atomic Weight" is suggested in spellcheckers for the following: atomic wieght. (additional references) | |
| Source: compiled by the editor, based on several corpora (additional references). | |
Scrabble® Enable2K-Verified Anagrams | |
| Words within the letters "a-c-e-g-h-i-i-m-o-t-t-w" | |
-3 letters: hematitic. | |
-4 letters: amitotic, chigetai, chowtime, cogitate, mitigate, thematic. | |
-5 letters: achiote, comitia, cottage, cowhage, gametic, gothite, hematic, imitate, megahit, meiotic, mitotic, oghamic, titmice, totemic. | |
| Source: compiled by the editor from various references; see credits. SCRABBLE® is a registered trademark. All intellectual property rights in and to the game are owned in the U.S.A and Canada by Hasbro Inc., and throughout the rest of the world by J.W. Spear & Sons Limited of Maidenhead, Berkshire, England, a subsidiary of Mattel Inc. Mattel and Spear are not affiliated with Hasbro. | |
| 1. Definition 2. Synonyms 3. Crosswords 4. Usage: Modern | 5. Usage: Commercial 6. Quotations: Non-fiction 7. Expressions 8. Expressions: Internet | 9. Translations: Modern 10. Derivations 11. Anagrams 12. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
