Attribute | ![]() Roentgenium × | ![]() Darmstadtium × |
---|---|---|
Oxidation states |
|
|
Atomic mass (u) | 282.169 | 282.166 |
Electron configuration | [Rn]7s²5f¹⁴6d⁹ (predicted) | [Rn]7s²5f¹⁴6d⁸ (predicted) |
Standard state | Solid (expected) | Solid (expected) |
Group name | Transition metal | Transition metal |
Atomic number | 111 | 110 |
Symbol | Rg | Ds |
Discovered (year) | 1994 | 1994 |