Antimony
Antimony
Antimony (Sb, atomic number 51) is a brittle, silvery-white metalloid known since ancient times, primarily sourced from the mineral stibnite. It is a critical, strategic material used in lead-acid batteries, flame retardants, plastics, and military applications like infrared sensors. While used medically for parasitic infections, it is toxic upon exposure. Key Facts and Properties Symbol/Atomic Number: Sb / 51Physical Properties: Brittle, silvery-white metal (metallic form) or gray powder (non-metallic).Melting Point: 630.6 °CDensity: 6.69 g/cm³Characteristics: Poor conductor of heat and electricity, expands upon cooling. Primary Uses Batteries: Enhances durability and conductivity in lead-acid batteries.Flame Retardants: Antimony trioxide is widely used in textiles, plastics, and electronics.Alloys: Used with lead and tin to improve hardness and strength for cable sheathing, solder, and pewter.Military/Tech: Used in infrared detectors, night vision goggles, and explosives.Medicine: Used to treat diseases like leishmaniasis. Environmental and Health Impact Toxicity: Exposure to high levels can damage the heart, lungs, liver, and stomach, causing symptoms like nausea, dizziness, and skin irritation.Regulation: Exposure is regulated by OSHA, NIOSH, and other agencies due to its toxic nature.Occurrence: Primarily found in stibnite (\(\text{Sb}_{2}\text{S}_{3}\)) and as a byproduct of mining lead. History Antimony was used as far back as 4000 BCE, with Egyptians using it for kohl eye makeup.It has long been used in traditional medicines and, in the Middle Ages, was used as a laxative.