Boron (B)
| Atomic Number | 5 |
|---|---|
| Atomic Mass | 10.81 u |
| Category | Metalloid |
| Electron Config | [He] 2s² 2p¹ |
| Appearance | black-brown |
| Density (STP) | 2460 g/L |
| Melting Point | 2349 K |
| Boiling Point | 4200 K |
| Electronegativity | 2.04 (Pauling) |
| Ionization Energy | 800.6 kJ/mol |
| Atomic Radius | 85 pm |
| Crystal Structure | Simple Trigonal |
| Discovered By | Joseph Louis Gay-Lussac (1808) |
Brief Introduction
Boron (B) is a metalloid element that appears as a dark, amorphous powder or as extremely hard, black crystalline material. It is essential in many industrial applications and biological processes. Key details about Boron (B) are as follows:
Uses: Used in borosilicate glass (Pyrex), fiberglass insulation, detergents and bleaches (borax, perborate), fertilizers, and high-strength composites for aerospace. Boron neutron capture therapy (BNCT) is used in cancer treatment.
Production/Extraction: Extracted from borax and kernite minerals, primarily from deposits in Turkey, the United States (California), and Argentina. Produced through reduction of boron oxide or electrolysis of molten salts.
History: Discovered independently by Joseph Louis Gay-Lussac and Louis-Jacques Thénard in France, and Humphry Davy in England, all in 1808. Named from the Arabic "buraq" and Persian "burah" (borax).
Health Effects & Safety: Essential micronutrient for plants and possibly for humans in trace amounts. Boric acid has low toxicity but high doses can be harmful. Boron compounds are used as mild antiseptics.
Price/Market: Relatively abundant and affordable. Turkey controls about 70% of global reserves, making it geopolitically significant for the boron market.
Properties: Exists in multiple allotropic forms, extremely hard (second only to diamond and cubic boron nitride), high melting point (2076°C), semiconductor properties, and forms strong covalent bonds.
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