Antimony (Sb)
| Atomic Number | 51 |
|---|---|
| Atomic Mass | 121.7601 u |
| Category | Metalloid |
| Electron Config | [Kr] 4d¹⁰ 5s² 5p³ |
| Appearance | silvery lustrous gray |
| Density (STP) | 6697 g/L |
| Melting Point | 903.78 K |
| Boiling Point | 1908 K |
| Electronegativity | 2.05 (Pauling) |
| Ionization Energy | 834 kJ/mol |
| Atomic Radius | 145 pm |
| Crystal Structure | Simple Trigonal |
| Discovered By | Ancient civilizations (-3000) |
Brief Introduction
Antimony (Sb) is a lustrous, silvery-gray metalloid that is brittle and has poor electrical and thermal conductivity. It has been used since ancient times and exists in multiple allotropic forms. Key details about Antimony (Sb) are as follows:
Uses: Used primarily in flame retardants (antimony trioxide synergist in plastics, textiles), lead-acid batteries (lead-antimony alloys for electrodes), semiconductors (indium antimonide, gallium antimonide), ceramics and glass (fining agent, opacifier), and in certain metal alloys (type metal, bearing alloys, pewter).
Production/Extraction: Extracted from stibnite (antimony sulfide) ore through roasting and reduction, or recovered from lead ores. China dominates global production (>70%). Also recovered from recycling of lead-acid batteries.
History: Known since ancient times; used in cosmetics (kohl eye makeup in ancient Egypt), medicines, and pigments. Alchemical symbol is circle with cross. Symbol Sb from Latin "stibium" (mark or cosmetic). Recognized as an element in medieval times.
Health Effects & Safety: Toxic—antimony and its compounds can cause cardiac, respiratory, and gastrointestinal issues. Chronic exposure leads to lung and skin problems. Antimony trioxide is classified as a possible carcinogen. Historically used (unwisely) in medicine as an emetic. No known biological role.
Price/Market: Moderate pricing; China's dominance creates supply concentration concerns. Flame retardant regulations and battery demand influence markets. Trade restrictions can cause price volatility.
Properties: Brittle and crystalline, poor conductor of heat and electricity, exhibits metallic luster, exists in multiple allotropes (most stable is metallic gray form), expands upon solidification (like bismuth and water), exhibits +3 and +5 oxidation states, and forms amphoteric oxides.
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