What does "oganesson" mean?

The chemical element (symbol Og) with atomic number 118. It is the heaviest known element. Highly radioactive, it does not occur naturally. Originally expected to be a noble gas, it is now predicted to be a reactive metallic solid, and a semiconductor or a post-transition metal.

What is a synonym for "oganesson"?

Common synonyms include: eka radon, eka-radon, og, og, ununoctium, ununoctium.

How do you pronounce "oganesson"?

Pronounced //oʊɡəˈnɛsɒn//.

Oganesson

//oʊɡəˈnɛsɒn// noun

noun ·Rare ·Advanced level

Definitions

Noun

1
The chemical element (symbol Og) with atomic number 118. It is the heaviest known element. Highly radioactive, it does not occur naturally. Originally expected to be a noble gas, it is now predicted to be a reactive metallic solid, and a semiconductor or a post-transition metal. uncountable
"SINGAPORE - The four new elements announced in December last year have received their new names: Nihonium (Nh), moscouvium (Mc), tennessine (Ts) and oganesson (Og)."

Synonyms

All synonyms

eka radon eka-radon og og ununoctium ununoctium

Example

More examples

"Given the atomic numbers 113, 115, 117 and 118, the four new elements have been named Nihonium (Nh), Moscovium (Mc), Tennessine (Ts) and Oganesson (Og), respectively."

Etymology

From Oganessian + -on. Promulgated in June 2016 by IUPAC based on recommendations of the Joint Institute for Nuclear Research and Lawrence Livermore National Laboratory to honor Russian-Armenian physicist Yuri Oganessian (born 1933) who researched superheavy elements. Suffix -on, rather than -ium, is because it is a noble gas (like neon or argon).

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.