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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 ...
For example, Pb is the symbol for lead (plumbum in Latin); Hg is the symbol for mercury (hydrargyrum in Greek); and He is the symbol for helium (a Neo-Latin name) because helium was not known in ancient Roman times. Some symbols come from other sources, like W for tungsten (Wolfram in German) which was not known in Roman times.
Alchemical symbols were used to denote chemical elements and compounds, ... silver, and lead had always been associated with the Sun, Moon, and Saturn. ...
Lead is a chemical element with symbol Pb and atomic number 82. Lead or The Lead may also refer to: Animal handling ... Lead, in project management, ...
How harmful is it that Lunchables contain lead? Dr. Carl Baum, a medical toxicologist for Yale Medicine who is the director of the Lead Poisoning and Regional Treatment Center in Connecticut ...
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
"Lead can be damaging to the developing brain," Calello says. "While adults can have effects from excess lead exposure as well, the effects are more severe in children and occur at lower levels."
Lead was often mixed into oil-based paints before 1978, the year lead paint was banned for residential use in the U.S. Over time, oil-based paints will crack in a distinctive alligator scale-like ...