1) Chemical element 2) German chemistry term 3) Synthetic element
Found on
https://www.crosswordclues.com/clue/roentgenium
Roentgenium is a chemical element with the symbol Rg and atomic number 111. It is an extremely radioactive synthetic element (an element that can be created in a laboratory but is not found in nature); the most stable known isotope, roentgenium-281, has a half-life of 26 seconds. Roentgenium was first created in 1994 by the GSI Helmholtz Centre fo...
Found on
http://en.wikipedia.org/wiki/Roentgenium
Rg noun a radioactive transuranic element
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.
