Attribute | Roentgenium × | Meitnerium × |
---|---|---|
Discovered (year) | 1994 | 1982 |
Atomic number | 111 | 109 |
Group name | Transition metal | Transition metal |
Oxidation states |
|
|
Electron configuration | [Rn]7s²5f¹⁴6d⁹ (predicted) | [Rn]7s²5f¹⁴6d⁷ (calculated) |
Atomic mass (u) | 282.169 | 277.154 |
Standard state | Solid (expected) | Solid |
1↓Symbol | Rg | Mt |