Page 43 - Curriculum Visions Dynamic Book

Ununoctium (Uuo)
Element 118. It is one of the most recently discovered elements and very little is so far known about it. Only a few atoms of element 118 have ever been made.The experiment was carried out using calculations by Robert Smolanczuk (Soltan Institute for Nuclear Studies, Poland) about the fusion of atomic nuclei.
The atoms were produced by fusing a krypton-86 ion with lead-208 atom using an accelerator.That produced 449 million electron volts, whose beam was directed onto targets of lead-208. It took 11 days to produce 3 atoms, which then decomposed in under
a millisecond (ms) to element
116, ununhexium. One atom
of element 118 is produced in
every 1,012 interactions between krypton and lead.
Discovery
It was discovered in 1999 by V. Ninov,
K. E. Gregorich,W. Loveland,A. Ghiorso,
D. C. Hoffman, D. M. Lee, H. Nitsche,W. J. Swiatecki, U.W. Kirbach, C.A. Laue, J. L.Adams, J. B. Patin, D. A. Shaughnessy, D. A. Strellis
and P.A.Wilk at Berkeley, California.
Technology
So little of it has been produced that it has no uses.
Geology
It does not occur naturally in the environment.
Biology
It does not occur in living things.
Key facts...
Name: ununoctium
Symbol: Uuo
Atomic number: 118
Atomic weight: 293
Position in Periodic Table: group 8 (18),
(noble gases); period 7
State at room temperature: not known,
but probably a gas
Colour: unknown
Density: n/a
Melting point: n/a
Boiling point: n/a
Origin of name: so far, this element has only
been given a temporary name according to an international scheme of established scientific procedures.
Shell pattern of electrons: 2–8–18–32–32–18–8
293 Uuo 118
289 Uuh 116
285 Uuq 114
281 Uub 112
277 Uun 110
273 Hs 108
289 Uuh + 42He (0.12 ms) 116
285 Uuq + 42He (0.60 ms) 114
281 Uub + 42He (0.58 ms) 112
277 Uun + 42He (0.89 ms) 110
273 Hs + 42He (3 ms) 108
269 Sg + 42He (1,200 ms) 106
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