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 pigeon Silvery pigeon The silvery pigeon ("Columba argentina"), also known as silvery wood-pigeon or grey wood-pigeon is a species of pigeon found in Indonesia and Malaysia. It was thought to be extinct but wild populations rediscovered in 2008 near Masokut Island might represent this species. The silvery pigeon is not distinguishable from the pied imperial pigeon at a distance, although this is not necessarily true vice versa; as the pied imperial pigeon can vary between a pale grey, pure white and even yellowish colouration, it is often possible to tell that a bird is "not" a "C. argentina". At close quarters,