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Some materials are so commonplace that we take them for granted One of those materials is a grayish metal that has been with us for thousands of years That metal is lead still one of the worlds most useful substances and one that never ceases to find a role in human society Lead has the atomic symbol of Pb for plumbum lead in Latin The atomic number for lead is 82 and the atomic mass is 20719 AMU It melts at about 327502 oC and boils at 1740 oC Lead is a heavy ductile soft gray solid It is soluble in nitric acid and insoluble in water It is found in North Central and South America Australia Africa and Europe In modern times lead has found a wide range of uses and world demand for lead and its products has steadily increased Leads usefulness stems from the metals many desirable properties softness high density low melting point ability to block radiation resistance to corrosion readiness to form alloys and chemical compounds and ease of recycling Its versatility as well as its physical and chemical properties accounted for its extensive use Lead can be rolled into sheets which can be made into rods and pipes It can also be molded into containers and mixed with other metallic elements Lead was used in ancient times for making coinage art objects and water pipes One of the first known toxic substances lead was used by the Romans for lining aqueducts and in glazes on containers used for food and wine storage and it is suspected to have resulted in widespread lead poisoning Members of the famous Franklin Expedition to the Northwest Passage in the mid-1840s met a similar fate being poisoned from lead in solder widely used at the time to seal tins used to store foods Until recently one of the most significant uses was an anti-knock additive
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