Boron

Physical Properties

Atomic number: 5
Atomic Weight: 10.81
Melting Point:2300°C
Boiling point:3658°C
Density: 2.35g/cm
Black or brown powder.

Chemical property

Boron can react with fluoride at room temperature, not affected by hydrochloric acid and hydrofluoric acid in aqueous solution. The powder can be dissolved in boiling nitric acid and sulfuric acid, and most of the molten metal such as cooper, iron, manganese, aluminum and calcium, but cannot soluble in water.