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It's Elemental

The Element Roentgenium

[Click for Isotope Data]

Roentgenium

111 Rg Roentgenium 281

Atomic Number: 111

Atomic Weight: 281

Melting Point: Unknown

Boiling Point: Unknown

Density: Unknown

Phase at Room Temperature: Expected to be a Solid

Element Classification: Metal

Period Number: 7

Group Number: 11

Group Name: none

Special Notes: Radioactive and Artificially Produced

What's in a name? Named after the scientist Wilhelm Conrad Röentgen.

Say what? Roentgenium is pronounced as RENT-ghen-ee-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-281, has a half-life of about 26 seconds and decays through spontaneous fission.

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 States: Unknown

Electron Shell Configuration:

1s2

(Unconfirmed)

2s2   2p6

3s2   3p6   3d10

4s2   4p6   4d10   4f14

5s2   5p6   5d10   5f14

6s2   6p6   6d10

7s1

Citation and linking information

For questions about this page, please contact Carol McKisson.