Precious metals are a group of rare and valuable elements that have been used for centuries in jewelry, coins, and other forms of currency. SILVER is a soft, white metal with the chemical symbol Ag and an atomic number of 47. It is the most abundant of the precious metals and has been used in coins, jewelry, and other forms of currency since ancient times. GOLD is a soft, yellow metal with the chemical symbol Au and an atomic number of 79. It is the most malleable and ductile of the precious metals and has been used in coins, jewelry, and other forms of currency since ancient times. Platinum is a dense, gray-white metal with the chemical symbol Pt and an atomic number of 78. It is the rarest of the precious metals and has been used in jewelry, coins, and other forms of currency since ancient times. Palladium is a silvery-white metal with the chemical symbol Pd and an atomic number of 46. It is the least dense of the precious metals and has been used in jewelry, coins, and other forms of currency since ancient times.