oganesson


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o·gan·es·son

(ə-găn′ə-sŏn′, ô′gə-nĕs′ŏn, -ən)
n. Symbol Og
An artificially produced radioactive element with atomic number 118, whose most stable isotope has a mass number of 294 and a half-life of 1.3 milliseconds.
[oganess- (after Yuri Oganessian (born 1933), Russian nuclear physicist and scientific director at the Joint Institute for Nuclear Research in Dubna, where the element was first synthesized) + -on.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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In 2016, four new elements were added to it: nihonium, moscovium, tennessine, and oganesson. Their atomic numbers--the number of protons in the nucleus that determines their chemical properties and place in the periodic table--are 113, 115, 117, and 118, respectively.
Is There an End to Periodic Table? MSU Professor Explores Its Limits
Oganesson, meanwhile, was named for Russian scientist Yuri Oganessian, who, along with his team, discovered the heaviest of all known elements.
The Periodic Table's Seventh Row Is Now Officially Complete

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