Metals: Chemistry Of Precious

orbitals are better screened, causing them to expand and become more chemically available.

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 Chemistry of Precious Metals

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. orbitals are better screened, causing them to expand

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 Au3++3e−→Aucap A u raised to the 3 plus

The behavior of precious metals, particularly gold and platinum, is heavily influenced by . As the atomic number ( ) increases, the inner

Rhodium (Rh) is uniquely efficient at reducing nitrogen oxides ( NOxcap N cap O sub x

Precious metals form stable bonds with carbon, leading to critical catalysts like the Grubbs' catalyst (Ruthenium) for olefin metathesis or Wilkinson’s catalyst (Rhodium) for hydrogenation. 4. Oxidation States and Geometry