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roentgenium

[ rent-gen-ee-uhm, -jen-, ruhnt- ]

noun

, Chemistry, Physics.
  1. a superheavy, synthetic radioactive element with a very short half-life. : Rg; : 111.


roentgenium

/ rĕnt-gĕnē-əm,-jĕn-,rŭnt-,rœnt-gĕn- /

  1. An artificially produced radioactive element with a mass number of 280. Its most stable known isotope has a half-life of 3.6 seconds. Atomic number 111.


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Word History and Origins

Origin of roentgenium1

First recorded in 2000–05; named after German physicist Wilhelm Konrad Roentgen.

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roentgen equivalent manroentgenize