Boron
Metalloid| Atomic number | 5 |
|---|---|
| Category | Metalloid |
| Atomic mass | 10.81 |
| Electron configuration | [He]2s² 2p¹ |
| Oxidation states | +3 |
| Electronegativity | 2.04 |
| Melting point | 2,076 °C |
| Boiling point | 3,927 °C |
| Density | 2.34 g/cm³ |
| Crystal structure | Rhombohedral |
| Group | 13 |
| Period | 2 |
| Block | p |
| Discovered | 1,808 |
| Crustal abundance | 10 ppm |
