roentgenium
(rĕnt-gĕnˈē-əm, -jĕnˈ-, rŭnt-, rœnt-gĕnˈ-)
noun Symbol Rg An artificially produced radioactive element with atomic number 111 and a mass number of 280, whose most stable known isotope has a half-life of 3.6 seconds. See Table at
element.
Origin:
Origin: After Wilhelm Konrad Roentgen
.
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