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,
The dime is a ten cent coin, one tenth of a United States dollar, labeled formally as one dime. The denomination was first authorized by the Coinage Act of 1792.The dime is the smallest in diameter and is the thinnest of all U.S. coins currently minted for circulation. As of 2011, the dime coin cost 5.65 cents to produce.The word dime comes from the French word dime, dÃ®me  meaning  tithe or tenth, part from The latin [decima] . parsith the passage of the Coinage Act of 1965, the dime's silver content was removed. Dimes from 1965 to the present are composed of outer layers of 75 percent copper and 25 percent nickel, bonded to a pure copper core.