roentgenium

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

Phonetic (Standard)IPA

noun

Chemistry, Physics.

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

roentgenium

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.
See Periodic Table

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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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Example Sentences

Examples have not been reviewed.

They are Darmstadtium, or Ds, which has 110 protons in its nucleus and was named after the town in which it was discovered; Roentgenium, or Rg, with 111 protons, named after the discoverer of X-rays Wilhelm Conrad Roentgen; and Copernicium, or Cn, which has 112 protons and is named after the Polish astronomer Copernicus, who disrupted the view that the Earth was the center of the universe.

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roentgen equivalent man roentgenize

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