element 118

American  

[el-uh-muhnt wuhn ay-teen] / ˈɛl ə mənt ˈwʌn ˌeɪˈtin /

noun

1. Chemistry. oganesson.

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element 118 Scientific  

1. An artificially produced radioactive element, detected indirectly by decay, whose most stable isotope has a mass number of 294 and a half-life of less than two milliseconds.

2. Also called ununoctium

3. See Periodic Table

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Example Sentences

But the periodic table contains still more; the heaviest so far is element 118, oganesson, a “super-heavy” element with 118 protons and a half-life of half a millisecond.

From New York Times • Aug. 27, 2019

Fittingly, no living person has shaped the architecture of the periodic table more than he has, which is why element 118 is called oganesson.

From Science Magazine • Jan. 30, 2019

Releasing an alpha changes the atom's identity: element 118 becomes 116, which becomes 114, and so on.

From Science Magazine • Jan. 30, 2019

Similarly, although element 118 falls into the noble gas column, theory predicts that it will readily attract electrons—something no other noble gas does.

From Science Magazine • Jan. 30, 2019

Oganesson, formerly known as element 118, is named after Yuri Oganessian, a Russian nuclear physicist.

From Slate • Jun. 17, 2016