Period 5 element and because of its rarity, rhodium is usually alloyed with platinum or palladium and applied in high-temperature and corrosion-resistive coatings. White gold is often plated with a thin rhodium layer to improve its optical impression while sterling silver is often rhodium plated for tarnish resistance. Rhodium detectors are used in nuclear reactors to measure the neutron flux level. Palladium is a chemical element with the chemical symbol Pd and an atomic number of 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
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.