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
Silvery-throated jay Silvery-throated jay The silvery-throated jay ("Cyanolyca argentigula") is a species of bird in the family Corvidae. It is found in Costa Rica and Panama where its natural habitat is subtropical or tropical moist montane forests. The IUCN has rated its conservation status as being of "least concern". The silvery-throated jay is a distinctive small jay, unlikely to be confused with any other bird found within its range. The sexes are similar, with the adult being about in length including the long tail. The head is black with a narrow but obvious white supercilium, and it bears an inconspicuous crest of