https://mineraly.pt/o-mineralogia/elementos/nao-classificado/roentgenium
Elemento químico roentgenium — Mineraly
elementoroentgenium
https://chemreference.com/periodic-table/roentgenium/properties
Roentgenium (Rg) Properties | ChemReference Periodic Table
Roentgenium (Rg) is element 111 with atomic mass 282.000 u. A solid unknown. Explore properties on our interactive periodic table of the elements.
periodic tableroentgeniumproperties