Attribute | Rutherfordium × | Meitnerium × |
---|---|---|
Discovered (year) | 1964 | 1982 |
Atomic number | 104 | 109 |
Group name | Transition metal | Transition metal |
Oxidation states |
|
|
Electron configuration | [Rn]7s²5f¹⁴6d² | [Rn]7s²5f¹⁴6d⁷ (calculated) |
1↑Atomic mass (u) | 267.122 | 277.154 |
Standard state | Solid | Solid |
Symbol | Rf | Mt |