Attribute | Meitnerium × | Darmstadtium × |
---|---|---|
Discovered (year) | 1982 | 1994 |
Atomic number | 109 | 110 |
Group name | Transition metal | Transition metal |
Oxidation states |
|
|
1↑Electron configuration | [Rn]7s²5f¹⁴6d⁷ (calculated) | [Rn]7s²5f¹⁴6d⁸ (predicted) |
Atomic mass (u) | 277.154 | 282.166 |
Standard state | Solid | Solid (expected) |
Symbol | Mt | Ds |