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    rhodium (Rh)

    rhodium
    Rhodium melted pellet.
    Image copyright: smart-elements.com
    A moderately hard, silvery-white, metallic element belonging to the platinum group of transition elements. Rhodium was discovered by William Wollaston in London in 1803; its name comes from the Greek rhodon meaning "rose." It occurs associated with platinum and its chief source is a by-product of nickel smelting.

    Rhodium resists tarnishing and corrosion; it is used in hard platinum alloys, as a mirror surface, to plate jewellery, and in an alloy with platinum as a catalyst in the Ostwald process. Its most common isotope is 103Rh (100%).


    atomic number 45
    relative atomic mass 102.91
    electron configuration [Kr]4d8 5s1
    relative density 12.4
    melting point 1,966°C (3,571°F)
    boiling point 3,727°C (6,741°F)


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