atomic weight(redirected from Atomic weights)
Also found in: Thesaurus, Medical, Encyclopedia.
Related to Atomic weights: nuclear atom
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.
(Chemistry) the former name for relative atomic massAbbreviation: at wt
the average weight of an atom of an element, based on 1/12 the weight of the carbon-12 atom. Abbr.: at. wt.
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.
Switch to new thesaurus
|Noun||1.||atomic 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