Ed note: Named roentgenium subsequent to this noder's posting.

It's in the last column of the transition metals on the periodic table, just like copper, silver, and gold. Note that the other three elements get more rare and valuable as they go down - but not even gold comes close to how valuable unununium is. Sure, there's only something like 100,000 cubic meters of gold on Earth, which in the proper perspective is not all that much, but only a few atoms of unununium have ever been made. Given how expensive the scientific equipment to make it is, I'd say it's worth several thousand dollars per atom, at least.

Of course, it's radioactive. So I guess you're better off having gold.

It will eventually have a different name and a chemical symbol, which is sad because Uuu looks nifty and unununium is fun as hell to type.

Roentgenium
Atomic Symbol Rg
Atomic Number 111
Atomic Weight 272
presumably a solid at 298 K
Color unknown, but probably metallic and silvery white or grey in appearance

Roentgenium is a synthetic element that is not present in the environment. Isolation of an observable quantity of roentgenium has never been achieved, and thus roentgenium has no known uses. The reactivity of roentgenium is unknown, but is assumed to be similar to gold and silver.

Roentgenium was first synthesized on December 8, 1994 at the Gesellschaft für Schwerionenforschung a.k.a the Institute for Heavy Ion Research a.k.a. GSI in Darmstadt, Germany, producing three atoms in an 18 day experiment using their heavy ion accelerator UNILAC, via
Bismuth(209) + Nickel(64) = Roentgenium(272) + 1 neutron

Originally named unununium, element 111 was renamed roentgenium on November 1, 2004, in honor of Wilhelm Roentgen. It is also sometimes referred to as eka-gold.

There are three known isotopes of roentgenium
²⁸⁰Rg with a half life of 3.6 seconds
²⁷⁹Rg with a half life of 170 milliseconds
²⁷²Rg with a half life of 1.5 milliseconds

                    gold
                     ^
darmstadtium <-- roentgenium --> ununbium