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,
Bali, one of the Indonesian islands in the South Pacific, uses Indonesia's rupiah as its main form of currency.Travelers heading to the island must ensure they have an understanding of the rupiah in advance to avoid being given an incorrect amount of change or an unfair exchange rate.upiah coins come in denominations of Rp 25, 50, 100, 500 and a new gold and silver Rp 1,000 coin, with both old and newly issued coin designs in circulation for Rp 500, 100 and 50 coins. As of publication, a U.S. dollar is worth just over 10,000 rupiahs.