Attribute | Meitnerium × | Seaborgium × |
---|---|---|
Discovered (year) | 1982 | 1974 |
Atomic number | 109 | 106 |
Group name | Transition metal | Transition metal |
Oxidation states |
|
|
1↓Electron configuration | [Rn]7s²5f¹⁴6d⁷ (calculated) | [Rn]7s²5f¹⁴6d⁴ |
Atomic mass (u) | 277.154 | 269.128 |
Standard state | Solid | Solid |
Symbol | Mt | Sg |