protium

UK/ˈpɹəʊ.tiəm//ˈpɹoʊ.tiəm/

protium noun: the lightest and most common isotope of hydrogen, having a single proton and no neutrons: 11H. It is the only stable nuclide with no neutrons.

Noun

protium (plural protiums)

The lightest and most common isotope of hydrogen, having a single proton and no neutrons: 11H. It is the only stable nuclide with no neutrons.
- So far there are no differences among the protiums extracted at various labs, except for concentration levels.
Synonyms:

hydrogen, hydrogen-1, hydrogen 1, light hydrogen, normal hydrogen
An atom of this isotope.
- This radioactive decay leaves behind a protium as well.

protium meaning in Tamil

protium in Tamil

புரோட்டீயம்

Synonyms of protium

All synonyms of protium

Forms of protium

plural	protiums

Origin of protium

From proto- + -ium. From Ancient Greek πρῶτος (prôtos, “first”).

Words formed from protium

diprotium

Questions about protium

What does protium mean?: Protium means the lightest and most common isotope of hydrogen, having a single proton and no neutrons: 11H. It is the only stable nuclide with no neutrons.
What is protium in Tamil?: Protium in Tamil is புரோட்டீயம். See Protium meaning in Tamil.
What part of speech is protium?: Protium is a noun.
How do you pronounce protium?: Protium is pronounced /ˈpɹəʊ.tiəm/ (UK).
What is the plural of protium?: The plural of protium is protiums.

Words near protium in the dictionary

Adapted from Wiktionary: protium (page history and authors); protium (Tamil Wiktionary) (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Neøn-protium.wav.

Cite this entry: “protium.” Word.ws, https://word.ws/protium. Based on Wiktionary, CC BY-SA 4.0.