The chemical element roentgenium is classed as a transition metal. It was discovered in 1994 by research scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany.
|Classification:||Roentgenium is a transition metal|
|Atomic weight:||(281), no stable isotopes|
|Neutrons in most abundant isotope:||170|
|Electron configuration:||[Rn] 5f14 6d9 7s2|
|Density @ 20oC:|
|Specific heat capacity||–|
|Heat of fusion||–|
|Heat of atomization||–|
|Heat of vaporization||–|
|1st ionization energy||–|
|2nd ionization energy||–|
|3rd ionization energy||–|
|Minimum oxidation number||–|
|Min. common oxidation no.||–|
|Maximum oxidation number||–|
|Max. common oxidation no.||–|
|Electronegativity (Pauling Scale)||–|
|Reaction with air||–|
|Reaction with 15 M HNO3||–|
|Reaction with 6 M HCl||–|
|Reaction with 6 M NaOH||–|
|Ionic radius (1+ ion)||–|
|Ionic radius (2+ ion)||–|
|Ionic radius (3+ ion)||–|
|Ionic radius (1- ion)||–|
|Ionic radius (2- ion)||–|
|Ionic radius (3- ion)||–|
Discovery of Roentgenium
Roentgenium was first made by research scientists at the Heavy Ion Research Laboratory in Darmstadt, Germany in 1994.
The element is named after physicist Wilhelm Conrad Röntgen who discovered X-rays in 1895.
Appearance and Characteristics
Roentgenium is harmful due to its radioactivity.
Roentgenium is a synthetic radioactive metal and has only been produced in minute amounts.
Uses of Roentgenium
Roentgenium is of research interest only.
Abundance and Isotopes
Abundance earth’s crust: nil
Abundance solar system: parts per billion by weight, parts per trillion by moles
Cost, pure: $ per 100g
Cost, bulk: $ per 100g
Source: Roentgenium is a synthetic radioactive metal, created via nuclear bombardment, and has only been produced in minute amounts. Roentgenium is produced by bombarding 209Bi with 64Ni in a heavy ion accelerator.
Isotopes: Roentgenium has 7 isotopes whose half-lives are known, with mass numbers from 272 to 282. None are stable. The most stable isotope is 281Rg, with a half-life of 23 seconds.
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