oganesson

Fetched 2026-10-26 (cache).

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Noun

1. {{senseid|en|Q1307}}{{lb|en|chemistry}} 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]]. <ref>[https://onlinelibrary.wiley.com/doi/epdf/10.1002/anie.201908327], "Oganesson Is a Semiconductor: On the Relativistic Band-Gap Narrowing in the Heaviest Noble-Gas Solids"</ref>

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