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Lead (/ l ɛ d /) 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. It tarnishes to a dull gray color when exposed to ...
Lead (Pb) 82 lead: Anglo-Saxon · Symbol Pb is from the Latin name plumbum, still visible in the English plumbing. [3] [56] Bismuth (Bi) 83 bisemutum: Neo-Latin from German "white mass" descriptive (colour) bisemutum is derived from German Wismuth, perhaps from weiße Masse, and means "white mass", due to its appearance. Polonium (Po) 84 ...
The Latin for lead is plumbum. In medieval times, anyone who worked with lead was referred to as a plumber; this can be seen from an extract about workmen fixing a roof in Westminster Palace; they were referred to as plumbers: "To Gilbert de Westminster, plumber, working about the roof of the pantry of the little hall, covering it with lead ...
Lead interferes with metabolism of bones and teeth [188] and alters the permeability of blood vessels and collagen synthesis. [5] Lead may also be harmful to the developing immune system, causing production of excessive inflammatory proteins; this mechanism may mean that lead exposure is a risk factor for asthma in children. [188]
The first letter is always capitalized. While the symbol is often a contraction of the element's name, it may sometimes not match the element's English name; for example, "Pb" for lead (from Latin plumbum) or "W" for tungsten (from German Wolfram). Elements which have only temporary systematic names are given temporary three-letter symbols (e.g ...
However, most children can have elevated lead levels and have no symptoms, which is why the American Academy of Pediatrics (AAP) recommends that kids be screened for lead exposure between the ages ...
Such use was so common that the word "plumbing" derives from plumbum, the Latin word for lead. This was a source of lead-related health problems in the years before the health hazards of ingesting lead were fully understood; among these were stillbirths and high rates of infant mortality. Lead water pipes were still widely used in the early ...
The plumb in plumb bob derives from Latin plumbum ('lead'), the material once used for the weighted bob at the end. [3] The adjective plumb developed by extension, as did the noun aplomb , from the notion of "standing upright".