Here you can read more about the chemical element Roentgenium. Its shemical symbol is Rg and its atomic number is 111. The relative atomic mass of Roentgenium is 281 u. The elemental classification of Roentgenium is Unknown chemical properties, and it belongs to group 11 and period 7 in the Periodic Table of Elements.
Roentgenium was discovered in the year 1994 by Gesellschaft für Schwerionenforschung.
To the right (or below if you are using a mobile device with a smaller screen) you will find the information given above for the element Roentgenium ordered in tabular form, which might be easier to read and use if you want to quantify it in some sort.