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Lead (pronounced "led") is a chemical element; it has symbol Pb (from Latin plumbum) and atomic number 82. It is a heavy metal that is denser than most common materials. Lead is soft and malleable, and also has a relatively low melting point. When freshly cut, lead is a shiny gray with a hint of blue.
22 Νοε 2024 · Lead, a soft, silvery white or grayish metal in Group 14 (IVa) of the periodic table. Lead is very malleable, ductile, and dense and is a poor conductor of electricity. Known in antiquity and believed by the alchemists to be the oldest of metals, lead is highly durable and resistant to corrosion.
Lead (II) compounds are ionic while those of lead (IV) are essentially covalent. The metal is amphoteric and forms lead salts, plumbites, and plumbates. When melted in air, lead oxidizes readily to its monoxide PbO (also called litharge).
Compounds of lead are sometimes called by this old name, such as plumbous chloride. Lead is a heavy, soft, gray solid. It is both ductile and malleable. Ductile means capable of being drawn into thin wires. Malleable means capable of being hammered into thin sheets.
21 Νοε 2024 · Lead can enter drinking water when plumbing materials that contain lead corrode, especially where the water has high acidity or low mineral content that corrodes pipes and fixtures. The most common sources of lead in drinking water are lead pipes, faucets, and fixtures.
11 Νοε 2023 · Under the EPA’s Lead and Copper Rule, corrosion inhibitors are added to water to slow the deterioration of metal pipes and prevent lead poisoning. Of the hundreds of possible contaminants in drinking water, these are the fifteen most likely to be in yours. Chlorine is the most common disinfectant used by public water systems.
Yes, lead is the original heavy metal, the most notorious offender in that toxic group. Lead damages the brain and the kidneys, it can cause anaemia and a form of gout with the doleful title of saturnine gout.
