common lead
common lead Lead which differs from primeval lead by the addition of radiogenic lead resulting from the decay of uranium and thorium (see DECAY SERIES), but which occurs in minerals whose U: Pb and Th: Pb ratios are so low that its isotopic composition does not change appreciably with time.
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Lead , Lead
Lead is in column IVA of the periodic table . It has four naturally occurring stable isotopes, lead-204, lead-206, lead-207, and lead-208. The l… Lead Poisoning , Lead is an indestructible heavy metal that can accumulate and linger in the body. Although the problem of lead exposure has been reduced in the Unite… leadwort , plumbago †yellow and red oxides of lead XVII; black lead, graphite XVIII: genus of plants, leadwort XVIII. — L. plumbāgō (i) lead ore, (ii) leadwort,… Periodic Table of the Elements Lead , lead (symbol Pb) Metallic element of group IV of the periodic table, known from ancient times. Its chief ore is galena (lead sulphide), from which le… leading , leading •scaffolding •freestanding, hardstanding, landing, misunderstanding, notwithstanding, outstanding, standing, stranding, understanding, upstan… Uranium-lead Dating , uranium-lead dating All naturally occurring uranium contains 238U and 235U (in the ratio 137.7:1). Both isotopes are the starting points for complex…
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common lead