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copper silver and gold are in group 11 of the periodic table these three metals have one s-orbital electron on top of a filled d-electron shell and are characterized by high ductility and electrical and thermal conductivity the filled d

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lead's close-packed face-centered cubic structure and high atomic weight result in a density of 11 34 g/cm 3 which is greater than that of common metals such as iron 7 87 g/cm 3 copper 8 93 g/cm 3 and zinc 7 14 g/cm 3

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i to assess information on the relationship between exposure to environmental pollutants and human health and to provide guidelines for setting exposure limits ii to identify new or potential pollutants iii to identify gaps in

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