GENERAL DESCRIPTION OF ELEMENT BORON (B) Boron is a chemical element and a light weight semimetal, with several of its properties listed below. Symbol B Atomic number 5 Atomic weight 10.81 Density 2.3 g/cc Valence 3 Melting point 2300 C (4172 F) Boiling point 2550 C (4622 F)

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