Atomic Weight
| Formula / Notation | Ar = weighted average of isotope masses |
|---|---|
| Also Known As | Relative atomic mass; Ar; standard atomic weight; atomic mass; average atomic mass |
What is Atomic Weight?
Atomic weight (also called relative atomic mass, Ar) is the weighted average mass of all naturally occurring isotopes of an element, relative to 1/12 the mass of carbon-12. It takes into account the natural abundance of each isotope. Atomic weight is dimensionless (or expressed in g/mol as molar mass) and appears on the periodic table.
Formula & Notation
Other Names / Synonyms: Relative atomic mass; Ar; standard atomic weight; atomic mass; average atomic mass
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Atomic weight (also called relative atomic mass, Ar) is the weighted average mass of all naturally occurring isotopes of an element, relative to 1/12 the mass of carbon-12. It takes into account the natural abundance of each isotope. Atomic weight is dimensionless (or expressed in g/mol as molar mass) and appears on the periodic table.
Stoichiometric calculations; molar mass determination; isotope ratio analysis (mass spectrometry); nuclear physics; geochronology and radiometric dating; quality control in chemical manufacturing
No hazard — a chemical property.
The formula or notation for Atomic Weight is: Ar = weighted average of isotope masses