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
Named set theory in which X and I are two constructive objects, for example, sets of words, and A is an algorithm that transforms X into I. In an algorithmic definition, a named set A = ("X", "A", "Y") consists of an algorithm "A", the set "X" of inputs, and the set "Y" of outputs. A name is given to a person, place, or thing to identify it. For example, parents can give their child a name or scientist can give an element a name. Examples of named sets include, Henri Poincaré (1908) wrote that without a name no object exists in science