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
Tre- (place name element) was evidence of political and linguistic distinction at some time from the 8th to 11th centuries. Tre- (place name element) Tre- is a place name element of Celtic origin meaning "hamlet, farmstead, estate", etc. which survives mainly in Wales and in the Southwest of England (almost exclusively in Cornwall). The manor of Trefusis was thus originally held before the Norman Conquest of 1066 by an Anglo-Saxon named "Fusis" or similar, thus "Farmstead of Fusis". The Cornish place-name beginning "Tre-" may be compared to the Cornish place-name beginning "Bod-" and the place-name endings "-worthy" and "-cot" in Devon, and "-ham" and