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 mole-rat Silvery mole-rat The silvery mole-rat, silvery blesmol, or silky mole-rat ("Heliophobius argenteocinereus") is a species of mole-rat of East Africa which occurs in southern Kenya, Tanzania, southeastern Zaire, Mozambique and Malawi. Solitary and aggressive, little is known about its ecology or behavior. It is monotypic in the genus Heliophobius. A common species, the International Union for Conservation of Nature has rated it as being of "least concern". This is a medium-sized mole-rat with soft, silky silvery-grey fur. The head is paler around the eyes, the sides of the face and the snout, and some individuals have a small white patch