Roentgenium

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(Redirected from Element 111)

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Roentgenium (former temporary name: unununium or eka-gold) is a chemical element in the periodic table that has the symbol Rg (formerly temporarily Uuu) and atomic number 111 making it one of the super-heavy atoms. It is a synthetic element whose longest-lived isotope has a mass of 280 and a half-life of 3.6 seconds. Due to its presence in Group 11 it is a transition metal and so probably would appear as a heavy, solid, shiny metal. Due to the inert pair effect, it should be colored like gold.

1 History
2 Isotopes
3 Trivia
4 See also
5 External links

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History

It was first created at the Gesellschaft für Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. Only three atoms of it were observed (all ²⁷²Rg), by the fusion of bismuth-209 and nickel-64 in a linear accelerator. (Nickel was bombarded onto the bismuth target.)

The name roentgenium was accepted as a permanent name on November 1 2004 in honor of Wilhelm Röntgen; before this date, the element was known under the temporary IUPAC systematic element name unununium. Some research has referred to it as "eka-gold".

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Isotopes

Three isotopes of roentgenium are known. The longest-lived of these is ²⁸⁰Rg which decays through alpha decay and has a half-life of 3.6 s. The shortest-lived isotope is ²⁷²Rg which decays through alpha decay and has a half life of 1.5 ms. The other known isotope, ²⁷⁹Rg, decays through alpha decay and has a half-life of 170 ms.

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Trivia

The elements in Group 11 used to informally be called the coinage metals, due to their historical use in coins. With a half-life no longer than 3.6 seconds, a roentgenium currency would present unique problems in any economic system.

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