Discovered By: Joseph Louis Gay-Lussac, Louis-Jacques Thenard, Humphry Davy.
Discovery year: 1808.

The following table showing some properties of Boron:

Table Example
Symbol B
Atomic number 5
Atomic weight 10.81
oxidation states +3
Electrons per shell K2 L3
Atomic radius 87 picometer
Covalent radius 84 picometer
Boiling point 4000°C
Melting point 2075°C
Electron configuration 1s^2 2s^2 2p^1


Table Example
Group 13
Block p
Period 2
Electrons 5
Protons 5
Neutrons 6
Phase Solid
Crystal structure rhombohedral
Fusion heat 50.2 kJ/mol
Heat of Vaporization 508 kJ/mol


Table Example
Color Black
Density (at melting point) 2.08 g/cm^3
Bulk modulus 320 GPa
Mohs hardness 9.3
Sound speed 16,200 m/s (at 20°C)
Thermal conductivity 27.4 W/(m-K)
Vickers hardness 49000 MPa
Electric type Insulator
Magnetic type Diamagnetic
Electromagnetivity 2.04
Valence 3
Radioactive No