relative atomic mass

noun

The ratio of the average mass per atom of the naturally occurring form of an element to 1/12 of the mass of a carbon-12 atom. Symbol Aᵣ; abbreviation RAM or r.a.m. For elements with several isotopes, the most stable isotope is treated as the representative.

Similar
atomic weightatomic mass
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Meanings

noun
  1. chemistryThe ratio of the average mass per atom of the naturally occurring form of an element to 1/12 of the mass of a carbon-12 atom. Symbol Aᵣ; abbreviation RAM or r.a.m. For elements with several isotopes, the most stable isotope is treated as the representative.

    Synonyms: atomic weight

Synonyms & antonyms

nounThe ratio of the average mass per atom of the naturally occurring form of an element to 1/12 of the mass of a carbon-12 atom. Symbol Aᵣ; abbreviation RAM or r.a.m. For elements with several isotopes, the most stable isotope is treated as the representative.

Similar
atomic weight

More synonyms by meaning

noun(chemistry) the mass of an atom of a chemical element expressed in atomic mass units

Similar
atomic massatomic weight
Broader
mass
Also see
atomic massatomic weight

Synonym sets from Open English WordNet, CC BY 4.0.

Translations

Chinese Mandarin 相對原子質量 /相对原子质量
  • 相對原子質量 /相对原子质量 (xiāngduì yuánzǐ zhìliàng)ratio
Finnish suhteellinen atomimassa
  • suhteellinen atomimassaratio
French poids atomique
  • poids atomiqueratio
Hungarian relatív atomtömeg
  • relatív atomtömegratio
Indonesian massa atom relatif
  • massa atom relatifratio
Irish mais adamhach choibhneasta
  • mais adamhach choibhneastaratio
Polish względna masa atomowa
  • względna masa atomowaratio
Portuguese massa atómica relativa, massa atômica relativa
  • massa atómica relativaratio
  • massa atômica relativaratio
Romanian masă atomică relativă
  • masă atomică relativăratio
Spanish peso atómico
  • peso atómicoratio
Swedish relativ atommassa
  • relativ atommassaratio
Welsh màs atomig cymharol
  • màs atomig cymharolratio
Cite this entry
APA

relative atomic mass. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/relative%20atomic%20mass

MLA

“relative atomic mass.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/relative%20atomic%20mass. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “relative atomic mass,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/relative%20atomic%20mass.

Source: relative atomic mass on Wiktionary, CC BY-SA 4.0.