Element Lead, Pb, Poor Metal. Calcium, which exhibits relations of isomorphism in both directions, stands in the middle. On the other hand, lead is decidedly a heavy metal, and forms an insoluble, dark-coloured sulphur compound. The combining weight of lead has been determined by the conversion of the metal into the oxide, and vice versa. It has been found to be Pb. Greeks called it molybdos; the same n.

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