111. Roentgenium
Name: Roentgenium
Symbol: Rg
Atomic Number: 111
Atomic Mass: (272.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 111
Number of Neutrons: 161
Classification: Transition Metal
Crystal Structure: Unknown
Density(293 K): Unknown
Color: Unknown
Element 111, roentgenium, chemically should be in the same group as the elements copper, silver, and gold (Group 11). It is a synthetic element whose only known isotope has a half-life of around 15 ms before it decays into meitnerium.
It was first created at the Gesellschaft fur Schwerionenforschung (GSI) in Darmstadt, Germany on December 8, 1994. Only three atoms of it have been created (all 272Rg), by the fusion of bismuth-209 and nickel-64 in a linear accelerator. (Nickel was bombarded onto the target.)
The name roentgenium was accepted as a permanent name on November 1, 2004 in honour of Wilhelm Roentgen; 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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