2006: Oganesson - The book of science

Oganesson

Russian and American scientists at Dubna
bombarded californium-249 with ions of calcium-48
and measured three decay events,
oganesson-294 decaying to livermorium-290,
livermorium-290 decaying to flerovium-286,
and flerovium-286 decaying to copernicium-282.

Atomic number 118

Only three or four atoms have been detected.
Only one isotope has been sythesized, so far,
with a half life of less than a millisecond.
Other isotopes, if they could be synthesized,
could have longer half lives.

An end

This end is probably not the final end.
Oganesson could have more isotopes
and each could be more stable than expected.
The periodic table could have another row
and ever more clever analyses could show
some improbabilities could become realities.

Some expect oganesson to be a gas at room temperatures, but relativistic effects might make it a solid. Before it could be proven to be a solid, its atoms would need to last long enough for two or more to be put together.

See also in The book of science:

Index of elements
1869—Periodic table—Dmitri Mendeleev

Readings on wikipedia:

“Yuri Oganessian”
“Oganesson”
“Isotopes of oganesson”
“Timeline of chemical element discoveries”

Other readings:

“Oganesson,” Elementymology & Elements Multidict, by Peter van der Krogt
“Synthesis of element 118,” Flerov Laboratory of Nuclear Reactions
“Synthesis of the isotopes of elements 118 and 116 in the ²⁴⁹Cf and ²⁴⁵Cm + ⁴⁸Ca fusion reactions,” Physical Review