Page 42 - Curriculum Visions Dynamic Book

Ununnilium (Uun)
Element 110. It is one of the most recently discovered elements and very little is so far known about it. Only a few atoms of element 110 have ever been made, although it is expected that its properties are similar to those of platinum, except for the fact that element 110 is unstable and decays
in a millisecond.
Those atoms that were made were
produced by the nuclear fusion of
an isotope of lead with one of nickel using a heavy ion accelerator. Many billion billion nickel atoms were fired at a lead target in order to produce a single atom of element 110.That took many days.
Discovery
Discovered by S. Hofmann,V. Ninov, F. P. Hessberger, P. Armbruster, H. Folger, G. Münzenberg, H. J. Schött and others at Darmstadt, Germany, in November 1994. Ununnilium is a temporary name and will be changed when international agreement has been reached.
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: ununnilium
Symbol: Uun
Atomic number: 110
Atomic weight: 272
Position in Periodic Table: transition metal,
group (10) (nickel group); period 7 State at room temperature: n/a 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: 2–8–18–32–32–17–1
42