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
Stars named after people with them in some way. The second, somewhat more obscurely, are those named after an individual but without explicitly making this clear. There is a small group of stars whose common names honour individuals. Many of these were highly significant in some way when discovered, usually through having some unusual characteristic. Some stars were given names that were disguised names of individuals, which names subsequently appeared in star catalogues and thus into more general usage. The earliest noted example was Sualocin and Rotanev, which names have now been approved by the IAU WGSN (see above). More recently, during the Apollo