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
Root element This property provides access to an object of type codice_4 which directly represents the root element of the document. There can be other XML nodes outside of the root element. In particular, the root element may be preceded by a "prolog", which itself may consist of an "XML declaration", optional comments, processing instructions and whitespace, followed by an optional "DOCTYPE declaration" and more optional comments, processing instructions and whitespace. After the root element there may be further optional comments, processing instructions and whitespace within the document. Within the root element, apart from any number of attributes and other elements, there