Phrase guide
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noun
Synonym of protium (“"the usual isotope of hydrogen"”).
Definition source: English Wiktionary via Wiktextract
Usage: uncountable
No example sentence was provided for this meaning.
Synonyms: protium
Antonyms: none provided
History
So named because it is the isotope of hydrogen with the lightest atomic weight and atomic mass, having one nucleon (a single proton and no neutrons).
