Chemistry Of Precious Metals -

Precious metals display a wide variety of oxidation states, though they generally prefer low-spin configurations: Predominantly +1positive 1 . It forms linear complexes like Gold (Au): Commonly +1positive 1 +3positive 3 typically adopts a square planar geometry.

) are central to modern solar energy conversion and light-driven organic synthesis due to their long-lived excited states. Summary Table Key Property Common Use Extreme malleability; Relativistic color Electronics, Jewelry, Nanomedicine Silver (Ag) Highest thermal/electrical conductivity Photography (historically), Antimicrobials Palladium (Pd) Hydrogen "sponge" Hydrogenation, Catalytic converters Platinum (Pt) High melting point; Bio-compatibility Chemotherapy, Fuel cells Rhodium (Rh) Extreme corrosion resistance NOxcap N cap O sub x reduction in vehicles Chemistry of Precious Metals

Most are insoluble in standard acids. Gold and platinum require Aqua Regia (a 3:1 mixture of HClcap H cap C l HNO3cap H cap N cap O sub 3 HNO3cap H cap N cap O sub 3 acts as an oxidant, while the Cl−cap C l raised to the negative power Precious metals display a wide variety of oxidation

Au3++3e−→Aucap A u raised to the 3 plus power plus 3 e raised to the negative power right arrow cap A u +1.52Vpositive 1.52 cap V Summary Table Key Property Common Use Extreme malleability;

The chemistry of precious metals—primarily the (platinum, palladium, rhodium, ruthenium, iridium, and osmium) along with gold and silver —is defined by their remarkable resistance to corrosion, high density, and unique electronic configurations.