Barium vs Mendelevium
| Property | Ba Barium | Md Mendelevium |
|---|---|---|
| Atomic number | 56 | 101 |
| Symbol | Ba | Md |
| Name | Barium | Mendelevium |
| Category | alkaline-earth-metal | actinide |
| Standard Atomic Weight | 137.327 u | 258 u |
| Period | 6 | 7 |
| Group | 2 | N/A |
| Block | s | s |
| Phase at STP | solid | solid |
| Electron configuration | [Xe]6s2 | [Rn]7s25f13 |
| Oxidation states | [1, 2] | [2, 3] |
| Electronegativity (Pauling) | 0.89 | 1.3 |
| Electron affinity | 0.1447 eV | 0.997 eV |
| Density | 3620 kg/m³ | 1.030000e+4 kg/m³ |
| Melting point | 726.85 °C | 826.85 °C |
| Boiling point | 1896.85 °C | -273.15 °C |
| Discovery year | 1808 | 1955 |