Boron is a chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar system and in the Earth crust.

Atomic Weight: 10.81
Density:       2.46 g/cm3
Melting Point: 2075 °C
Boiling Point: 4000 °C