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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. It tarnishes to a dull gray color when ...
Platinum is more ductile than gold, silver or copper, thus being the most ductile of pure metals, but it is less malleable than gold. ... Lead is a soft metal (MH 1.5 ...
Gold is extremely ductile. It can be drawn into a monatomic wire, and then stretched more before it breaks. [12]Ductility is especially important in metalworking, as materials that crack, break or shatter under stress cannot be manipulated using metal-forming processes such as hammering, rolling, drawing or extruding.
Lead is exceptionally soft, malleable, and ductile but with little tensile strength. Lead oxide is a poison, that primarily damages brain function. Metallic lead is more stable and less toxic than its oxidized form. Metallic lead cannot be absorbed through contact with skin, so may be handled, carefully, with far less risk than lead oxide.
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While nearly all elemental metals are malleable or ductile, a few—beryllium, chromium, manganese, gallium, and bismuth—are brittle. [40] Arsenic and antimony, if admitted as metals, are brittle. Low values of the ratio of bulk elastic modulus to shear modulus ( Pugh's criterion ) are indicative of intrinsic brittleness. [ 41 ]
The FDA recommends a maximum of 0.1 parts per million (ppm) of lead in candy, but many imported types exceed this limit. The lead usually comes from things like lead-based ink used on the ...
There appears to be a contradiction between the statement early in the article that "lead is only malleable [not ductile]" and the placement, one screen later, of lead in the list of ten "most ductile metals" (albeit at the end). Maybe that is the complete list of metals from that source and lead, being at the end, is supposed to have zero ...