Germanium - Argentium
In recent years germanium has seen increasing use in precious metal alloys. In sterling silver alloys, for instance, it has been found
to reduce firescale, increase tarnish resistance, and increase the
alloy's response to precipitation hardening. A tarnish-proof sterling silver alloy, trademarked Argentium, contains 1.2% germanium.
Because rhodium metal is inert against corrosion and most aggressive chemicals, 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 appearance while sterling silver is often rhodium plated for tarnish
Rhodium is a chemical element with symbol Rh and atomic number 45. It is a rare, silvery-white, hard, and
chemically inert transition metal. It is a member of the platinum group. It is composed of only one
naturally-occurring isotope, 103Rh. Naturally occurring rhodium is
usually found as the free metal, alloyed with similar metals, and rarely as a chemical compound in minerals such
as bowieite and rhodplumsite. It is one of the rarest and most valuable
Rhodium is a so-called noble metal, resistant to corrosion, found in platinum- or
nickel ores together with the other members of the platinum group metals. It was discovered in 1803 by William Hyde Wollaston in one such ore, and named
for the rose color of one of its chlorine compounds, produced after it reacted with the powerful acid mixture
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