Platinum

Platinum is a chemical element; it has symbol Pt and atomic number 78. It is a dense, malleable, ductile, highly unreactive, precious, silverish-white transition metal. Its name originates from Spanish , a diminutive of "silver".

six noble, precious metallic elements clustered together in the periodic table: ruthenium, rhodium, palladium, osmium, iridium, and platinum

thumb|A hallmark is Punch (tool)|punched into a section of a silver chain by a [[silversmith.]] A hallmark is an official mark or series of marks struck on items made of metal, mostly to certify the content of noble metals—such as platinum, gold, silver and in some nations, palladium. In a more general sense, the term hallmark is used to refer to any standard of quality. Not to be confused with responsibility marks that are the marks of the maker.

mountain

isotopes of platinum

finely powdered platinum used as a catalyst

light metallic color

astronomical symbol for the planet Uranus

alloys of the precious metals platinum and iridium

nanoparticle