- CORRECTION: On Aug. 15, 2016, this graphic was updated to correct the year when the penny acquired its current composition. It was 1982, not 1984. Also, the graphic was updated to reflect that coins are struck from planchets (not cast from molten metal) and some (not all) dollar coins produced between 1849 and 1889 contained 90% gold.
Volume 94 Issue 28 | p. 29
Issue Date: July 11, 2016
Periodic graphics: the compositions of U.S. coins
Chemical educator and Compound Interest blogger Andy Brunning shares some fun facts about the metals in pennies, nickels, dimes, and quarters
- Chemical & Engineering News
- ISSN 0009-2347
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