unununium

== English == === Etymology === Systematic element name, from un- +‎ un- +‎ un- +‎ -ium. === Pronunciation === === Noun === unununium (uncountable) (dated) roentgenium. ==== Coordinate terms ==== Previous: darmstadtium Ds; Next: copernicium Cn ==== Translations ==== === References === http://elements.vanderkrogt.net/element.php?sym=Rg == Danish == === Etymology === Systematic element name. === Noun === unununium n (singular definite unununiummet, not used in plural form) (dated) roentgenium Synonym: roentgenium ==== Declension ====