An electron is a subatomic particle with a negative electric charge that is equal, but opposite to, the positive charge of a proton.
Guinea (coin) The guinea was a coin of approximately one quarter ounce of gold that was minted in Great Britain between 1663 and 1814. The name came from the Guinea region in West Africa, where much of the gold used to make the coins originated. It was the first English machine-struck gold coin, originally worth one pound sterling, equal to twenty shillings, but rises in the price of gold relative to silver caused the value of the guinea to increase, at times to as high as thirty shillings. From 1717 to 1816,
(1938-2017) With an exception of the War Nickels 1942-1945 (56% copper, 35% silver, and 9% manganese minted during World War II) it has always contained 75% copper and 25% nickel. The nickel is one of the most valuable coins minted in terms of its actual intrinsic metal value. At the time this article was written the coin is worth .07 or .08 each. Because of this there is a melt ban in place on nickels to prevent people from buying thousands of dollars worth of these coins, and melting them down for a hefty profit. The Jefferson nickel is 21.21 mm in diameter and weighs 5 g. Since it has always lacked much intrinsic value it does not have a reeded edge like other white metalic coins, and thus there is no reason for persons to scrape it's metal edges for shavings.