Meaning & use
roentgenium
A radioactive chemical element with the symbol Rg and atomic number 111, created artificially in laboratories.
See it in a sentence
Roentgenium was first synthesized in 1994 by bombarding bismuth atoms with nickel ions.
Scientists have only ever produced a handful of atoms of roentgenium at a time.
A note on using this word
Roentgenium is named after physicist Wilhelm Rontgen, who discovered X-rays; it does not occur naturally and has no practical uses outside research.
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