Einsteinium vs Mendelevium
| Property | Es Einsteinium | Md Mendelevium |
|---|---|---|
| Atomic number | 99 | 101 |
| Symbol | Es | Md |
| Name | Einsteinium | Mendelevium |
| Category | actinide | actinide |
| Standard Atomic Weight | 252 u | 258 u |
| Period | 7 | 7 |
| Group | N/A | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Rn]7s25f11 | [Rn]7s25f13 |
| Oxidation states | [2, 3, 4] | [2, 3] |
| Electronegativity (Pauling) | 1.3 | 1.3 |
| Electron affinity | -0.3 eV | 0.997 eV |
| Density | 8840 kg/m³ | 1.030000e+4 kg/m³ |
| Melting point | 859.85 °C | 826.85 °C |
| Boiling point | -273.15 °C | -273.15 °C |
| Discovery year | 1952 | 1955 |