Any US cent dated 1982 and before is mostly copper, billions are still in circulation and are face value.
Actually, the penny went from 95% copper before 1982 to 0.8% Copper after 1982. The newer coins are less valuable because they are essentially copper plated zinc coins. This saved the government some money in minting coins.
1 cent
One cent, but it's not copper, just copper-plated. US cents have been mostly zinc since mid-1982.
It is worth face value unless it has a S under the date.
A 1983 Lincoln cent is actually copper plated zinc, 1982 was the last year for copper pennies. It's just a penny.
Next to none. Post-1982 pennies are only plated with copper, they are mostly zinc. The amount of copper on a post-1982 penny is miniscule and costs more to remove than melt value is.
A 1982 penny is heavier than a 2006 penny. In 1982, the composition of the penny changed from being mostly copper to mostly zinc. The higher copper content in the 1982 penny makes it heavier than the 2006 penny, which is mostly zinc.
The US penny with the most copper is the 1982 penny, which was produced in two different compositions. Before mid-1982, pennies were made of 95% copper and 5% zinc, while after mid-1982, the composition changed to 97.5% zinc and 2.5% copper. Therefore, the 1982 pennies minted before June contain the highest copper content. Collectors often seek these earlier versions for their higher metal value.
did they make 1982 copper penny by mistake
Yes. As of January 14, 2010, with copper at $3.3764/lb and zinc at $1.1251/lb, a pre-1982 penny (95% copper and 5% zinc) has a "melt" value of 2.23774 cents. See the website http://www.coinflation.com/ for current "melt" values.
If by formula you mean composition, a post-1982 penny is 97.5% Zinc and 2.5% Copper by mass.
Any US cent dated 1982 and before is mostly copper, billions are still in circulation and are face value.
1982
Pretty much non-existent. Post-1982 pennies are zinc with a very thin copper coating and contain very little copper of any economic value.
Pre 1982 and some 1982 cent coins are mostly copper. Copper is a commodity traded on a daily basis si the actual price changes daily. An old copper penny has about 3 cents of copper in it, but before you rush down to melt all those copper cents you need to know that congress by law has made it isillegalto do so.
The last year for copper US pennies was 1982.