About a third of a cent US, since a pre-1982 penny has a mass of slightly over 3 grams and is about 95% copper (the remainder is zinc). Many of these pennies are still in circulation.
The price on 100 grams of Mercury is $36.10.
1245.99lb 1245.99lb
about $80 a kg.
gram of Arsenic (As) is $3.20 for 1 gram.