1896, translation of Ger. X-strahl, from X, algebraic symbol for an unknown quantity, + Strahl (pl. Strahlen) "beam, ray." Coined 1895 by Ger. scientist Wilhelm Conrad Röntgen (1845-1923), who discovered them.
In 1901 Röntgen was awarded the very first Nobel Prize in Physics.
In November 2004 IUPAC named element number 111 Roentgenium (Rg) in his honour.
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