Privacy and Security Notice

Jefferson Lab
Jefferson Lab HomeSearchContact JLab
Science Education
----------------------
Science Education HomeTeacher ResourcesStudent ZoneGames and PuzzlesPrograms and EventsSearch Education
It's Elemental
Previous ElementPrevious ElementTable of ElementsNext ElementNext Element
 111
Rg
Roentgenium
280
Roentgenium
Atomic Number:111
Atomic Weight:280
Melting Point:Unknown
Boiling Point:Unknown
Density:Unknown
Phase at Room Temperature:Expected to be a Solid
Element Classification:Metal
RadioactiveArtificially Produced
Period Number:7Group Number:11Group Name:none
What's in a name?Named after the scientist Wilhelm Conrad Röentgen.
Say what?Roentgenium is pronounced as RENT-ghen-i-em.
History and Uses:

Roentgenium was first produced by Peter Armbruster, Gottfried Münzenber and their team working at the Gesellschaft für Schwerionenforschung in Darmstadt, Germany in late 1994. They bombarded atoms of bismuth-209 with ions of nickel-64 with a device known as a linear accelerator. This produced three atoms of roentgenium-272, an isotope with a half-life of about 1.5 milliseconds (0.0015 seconds), and a free neutron.

Roentgenium's most stable isotope, roentgenium-280, has a half-life of about 3.6 seconds. It decays into meitnerium-276 through alpha decay.

Since only a few atoms of roentgenium have ever been produced, it currently has no uses outside of basic scientific research.

Estimated Crustal Abundance:Not Applicable
Estimated Oceanic Abundance:Not Applicable
Number of Stable Isotopes:0(View all isotope data)
Ionization Energy:Unknown
Oxidation State:Unknown
Electron Shell Configuration:
(Unconfirmed)
1s2
2s22p6
3s23p63d10
4s24p64d104f14
5s25p65d105f14
6s26p66d10
7s1

This page is maintained by Steve Gagnon.

Citation and linking information