Among precious metals, platinum deserves special attention because of several of its characteristics. Unlike gold or silver, platinum is an extremely hard metal, with high wear resistance. Alloying platinum with gold makes the alloy more malleable. Platinum is denser than gold and has with 21.45 g/cm³ over twice the density of silver. It melts at a higher temperature (1768.3 °C or 2041.4 K) than silver or gold. Unlike silver and palladium[1] and similar to gold, platinum is not corroded in any normal environment.
(With graphs updated as of Jan 5, 2017)
(With graphs updated as of Jan 5, 2017)