Boron vs Meitnerium
| Property | B Boron | Mt Meitnerium |
|---|---|---|
| Atomic number | 5 | 109 |
| Symbol | B | Mt |
| Name | Boron | Meitnerium |
| Category | metalloid | transition-metal |
| Standard Atomic Weight | 10.8135 u | 278 u |
| Period | 2 | 7 |
| Group | 13 | 9 |
| Block | p | s |
| Phase at STP | solid | N/A |
| Electron configuration | [He]2s22p1 | [Rn]7s25f146d7(calculated) |
| Oxidation states | [-5, -1, 0, 1, 2, 3] | [1, 3, 4, 6, 8, 9] |
| Electronegativity (Pauling) | 2.04 | N/A |
| Electron affinity | 0.27972 eV | 1.7 eV |
| Density | 2370 kg/m³ | 3.740000e+4 kg/m³ |
| Melting point | 2074.85 °C | -273.15 °C |
| Boiling point | 3999.85 °C | -273.15 °C |
| Discovery year | 1808 | 1982 |