Boron vs Mendelevium
| Property | B Boron | Md Mendelevium |
|---|---|---|
| Atomic number | 5 | 101 |
| Symbol | B | Md |
| Name | Boron | Mendelevium |
| Category | metalloid | actinide |
| Standard Atomic Weight | 10.8135 u | 258 u |
| Period | 2 | 7 |
| Group | 13 | N/A |
| Block | p | s |
| Phase at STP | solid | solid |
| Electron configuration | [He]2s22p1 | [Rn]7s25f13 |
| Oxidation states | [-5, -1, 0, 1, 2, 3] | [2, 3] |
| Electronegativity (Pauling) | 2.04 | 1.3 |
| Electron affinity | 0.27972 eV | 0.997 eV |
| Density | 2370 kg/m³ | 1.030000e+4 kg/m³ |
| Melting point | 2074.85 °C | 826.85 °C |
| Boiling point | 3999.85 °C | -273.15 °C |
| Discovery year | 1808 | 1955 |