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