1982 Copper Lincoln Cent.big Chunk Missing

Deliberate damage beyond a doubt.

:Nothing in the minting process could produce this. Clipped planchets are much different with markers like the Blakesly effect being a prime one to check for.
Yours does not have it. :(

Huh..yeah I thought someone must have done this PM because the edges have area where they arent smooth and darkened as I would assume they would be after 40 yrs..also, is 2.85g still too low to be copper? I have an 83 and it rings like a bell when I drop it but tips the triple beam at 2.85 every time

With that much material missing from your Cent, and it still weighs 2.85 grams, I can pretty much assure you it is a copper Cent. You can also tell it is copper by the lack of the shiny silver (zinc) core where it has been damaged. Still just a damaged Cent but at the same time worth more than face value due to the copper content but not much.
Now....if you have a 1983 Lincoln that weighs 2.85 grams... PLEASE STOP dropping it to hear a "ring" tone as this will only damage your coin. If you just happened to be lucky enough to have found a 1983 copper Lincoln Cent (which I don't think there would be a noticeable difference in a tone as can be heard with the likes of a Silver Coin) then please show us some pics in a new post. Please use a calibrated scale that reads in hundredths of a gram. Would love to see it.