text: how many copper atoms in a 2006 us cent?   a 2006 us cent weighs 2.5 g and is 2.4% copper, so the total weight of copper is 0.060g.  so the calculation would be:  (0.06g copper) / (63.546g/mol copper) * (6.02214*10^23 atom/mol copper) = 5.69*10^20 atoms copper  p.s. - in response to emetalshop above, a penny is not made from an alloy, it consists of a zinc slug with a thin layer of copper plating.  the percentages by weight are 97.6% zinc and 2.4%copper.