7 articles
Iridium
Iridium is a hard, silvery-white platinum-group metal, the most corrosion-resistant element known, discovered in 1803 and famous for the asteroid-impact layer marking the dinosaur extinction.
Osmium
Osmium is a hard, bluish-silver platinum-group metal, atomic number 76, often cited as the densest element, discovered in 1803 and known for its very toxic tetroxide and hard, wear-resistant alloys.
Palladium
Palladium (Pd, atomic number 46) is a silvery-white transition metal of the platinum group, discovered by William Hyde Wollaston in 1803 and best known as the active metal in automotive catalytic converters.
Platinum
Platinum is a chemical element with symbol Pt and atomic number 78, a dense, silvery-white metal best known for catalytic converters, jewelry, and the cancer drug cisplatin.
Platinum group
The platinum group is a set of six chemically similar transition metals: platinum, palladium, rhodium, ruthenium, iridium, and osmium, mostly mined in South Africa, Zimbabwe, and Russia.
Rhodium
Rhodium is a chemical element with symbol Rh and atomic number 45, a rare, expensive silvery-white platinum-group metal best known for reducing nitrogen oxides in car catalytic converters.
Ruthenium
Ruthenium (Ru) is a hard, silvery transition metal, atomic number 44, and one of the six platinum-group metals, used mainly in chip resistors, electrical contacts, and catalysts.