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Lead - Wikipedia
Lead is a chemical element with the symbol Pb (from the Latin plumbum) and atomic number 82. It is a heavy metal denser than most common materials. Lead is ...
en.wikipedia.org
en.wikipedia.org
LEAD Definition & Meaning - Merriam-Webster
1. a : to guide on a way especially by going in advance led the officers to his hiding place b : to direct on a course or in a direction a road leading the ...
www.merriam-webster.com
www.merriam-webster.com
Learn about Lead | US EPA
Lead is a naturally occurring element found in small amounts in the earth's crust. While it has some beneficial uses, it can be toxic to humans and animals, ...
www.epa.gov
www.epa.gov
lead
Britannica Dictionary definition of LEAD. 1. a : to guide someone to a place especially by going in front. [no object] You lead and we'll follow right behind you. [+ object] He led [= took] me into a room in the back of the house. You lead us and we'll follow right behind you. — often + to.
www.britannica.com
Lead poisoning - World Health Organization (WHO)
Lead is a naturally occurring toxic metal found in the Earth's crust. Its widespread use has caused extensive environmental contamination, human exposure
www.who.int
www.who.int
About Childhood Lead Poisoning Prevention - CDC
There are no safe levels of lead in the blood. Many children ingest lead dust by putting objects such as toys and dirt in their mouths.
www.cdc.gov
www.cdc.gov
lead
The chemical element lead is a metal that is poisonous to humans. However, it has been used since ancient times, and it still has many uses. Scientists use symbols to stand for the chemical elements. The symbol for lead is Pb, which comes from the Latin word for lead, plumbum .
kids.britannica.com
Lead | National Institute of Environmental Health Sciences
Lead, a metal found throughout the earth, has been used in a variety of products including gasoline, paint, plumbing pipes, ceramics, solders, batteries, and ...
www.niehs.nih.gov
www.niehs.nih.gov
Lead - Element information, properties and uses | Periodic Table
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 ...
periodic-table.rsc.org
periodic-table.rsc.org
Lead poisoning - Symptoms & causes - Mayo Clinic
Lead poisoning occurs when lead builds up in the body, often over months or years. Even small amounts of lead can cause serious health problems.
www.mayoclinic.org
www.mayoclinic.org
Lead | Pb (Element) - PubChem
Lead is a chemical element with symbol Pb and atomic number 82. Classified as a post-transition metal, Lead is a solid at 25°C (room temperature).
pubchem.ncbi.nlm.nih.gov
pubchem.ncbi.nlm.nih.gov
Lead | Definition, Uses, Properties, & Facts - Britannica
Lead (Pb), 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 ...
www.britannica.com
www.britannica.com
lead
▪ I. lead, n.1 (lɛd) Forms: 1–2 léad, 3 læd, 3–4 leod(e, 4 Kentish lyad, 3–6 led(e, 4–6 leyde, 4–7 leed(e, Sc. leid(e, 5–6 ledde, (6 dial. lydde), 5– 7 lead(e, 4– lead. [OE. léad str. neut. = OFris. lâd, Du. lood lead, MLG. lôd (whence Sw. and Da. lod), MHG. lôt (mod.G. lot, loth) plummet, sounding-...
Oxford English Dictionary
prophetes.ai
Lead–lead dating
Lead–lead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite. initial lead isotope ratios matching those of the Canyon Diablo iron meteorite.
wikipedia.org
en.wikipedia.org
lead
lead/led; lɛd/ n1 [U] (chemistry 化) heavy soft metal of dull greyish colour, used for water pipes, in roofing, as a radiation shield, etc and which is mixed with other metals to form alloys 铅. =>App 10 见附录10.2 [C, U] (thin stick of) graphite used as the part of a pencil that makes a mark 铅笔心.3 [C] (...
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