Standard atomic weight
id:
standard-atomic-weight-168-7534840
title:
Standard atomic weight
text:
The standard atomic weight of a chemical element (symbol Ar°(E) for element "E") is the weighted arithmetic mean of the relative isotopic masses of all isotopes of that element weighted by each isotope's abundance on Earth. For example, isotope ⁶Cu (Ar = 62.929) constitutes 69% of the copper on Earth, the rest being ⁶⁵Cu (Ar = 64.927), so
- A r ° ( 29 Cu ) = 0.69 × 62.929 + 0.31 × 64.927 = 63.55. Because relative isotopic masses are dimensionless quantities, this weighted mean is also dimensi
brand slug:
wiki
category slug:
encyclopedia
description:
Relative atomic mass as defined by IUPAC (CIAAW)
original url:
https://en.wikipedia.org/wiki/Standard_atomic_weight
date created:
2007-03-29T21:27:58Z
date modified:
2024-08-31T02:45:30Z
main entity:
{"identifier":"Q28912964","url":"https://www.wikidata.org/entity/Q28912964"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/d/de/CIAAW_2013_-_Standard_atomic_weight_for_cupper_%2829%2C_Cu%29.svg","width":556,"height":666}
fields total:
13
integrity:
16