Palladium Palladium Palladium is a chemical element with symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. More than half the supply of palladium
Mississippi silvery minnow Texas, and New Mexico. The Mississippi silvery minnow gets its name in part to its appearance. The majority of this fish is covered in silver scales that are very reflective with a large dark stripe down the center of their back. The average minnow length is between 12 and 13 centimeters. The Mississippi silvery minnow has a lateral line on each side of its body. These minnows have a pair of pectoral fins, along with a pair of small pelvic fins. The Mississippi silvery minnow, like many other minnows, have an anal fin, dorsal fin, and a powerful caudal fin.