Name:
Boron
Symbol:
B
Atomic Number:
5
Atomic Mass:
10.811 +/- 0.003
Atomic Volume:
4.67 cc/mol
Discovered By:
First isolated by Sir Humphrey Davy in 1808
Discovery Date:
1808
Origin of Name:
Boron - (Arabic) Buraq
Toxicity:
Not toxic. Finely dispersed powder has a harmful effect on the lungs. Compounds not toxic. Fatal when taken internally in large amounts (5-20 g). Some compounds such as chromium boride are toxic (finely dispersed insoluble powders).
Summary:
Boron is not found free in nature, but usually as borates such as borax (Na
2
B
4
O
7
). Pure Boron crystals (alpha-tetragonal) are almost as hard as diamond.
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