Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Boron | |
| Electron Configuration | 2,3 |
| Electron Configuration | 1s2 2s2 2p1 |
| Electronegativity | 2.04 |
| Enthalpy of Fusion | 22.2 kJ mol-1 |
| Enthalpy of Vaporisation | 504.5 kJ mol-1 |
| Heat Capacity | 11.087 J mol-1 K-1 |
| Thermal Conductivity | 27.4 W m-1 K-1 |
| Thermal Expansion | 5 - 7 μm m-1 K-1 |
| Magnetic ordering | Non-magnetic |
| Electrical resistivity | 1.5 x 104 Ω m |
| Speed of sound | 16200 m s-1 |
| Bulk modulus | 185 GPa |
| Mohs hardness | 9.3 |
| Vickers hardness | 49000 MPa |
| Atomic Radii |
|
| Atomic Radius
|
85 pm |
| Bohr Radius
|
87 pm |
| Covalent Radius
|
82 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
B+3 |
| Other
|
|
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
800.6 |
| M+ - M2+ |
2427 |
| M2+ - M3+ |
3660 |
| M3+ - M4+ |
25025 |
| M4+ - M5+ |
32822 |
| Covalent Bonds (kJ mol-1) |
|
| B-H
|
381 |
| B-H-B
|
439 |
| B-C
|
372 |
| B-O
|
523 |
| B-F
|
644 |
| B-Cl
|
444 |
| B-B
|
335 |