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CURRENCY AND METAL
July 18th 2016
Historically, different precious metals have been used to make coins used for currency. Indeed, before there were standardised currency systems with coins, metals themselves were used on their own as a precious commodity representing value typically those considered precious metals such as gold and silver.
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LEAD
July 5th 2016
Lead is a chemical element belonging to the carbon group. Its symbol is Pb and it has an atomic number of 82. Lead is a post-transition metal in the periodic table and is characterised by a blue/white colour when freshly cut, that gradually tarnishes to a duller grey with air exposure.
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