翻訳と辞書 Words near each other ・ Platon Kostiuk ・ Platon Krivoshchyokov ・ Platon Lebedev ・ Platon Levshin ・ Platon Maiboroda ・ Platon Obukhov ・ Platon Oyunsky ・ Platon Pchyolkin ・ Platon Poretsky ・ Platon Shirinsky-Shikhmatov ・ Platinum Fashion Mall ・ Platinum Film ・ Platinum fulminate ・ Platinum Game ・ Platinum Grit ・ Platinum group ・ Platinum hexafluoride ・ Platinum High School ・ Platinum Highway ・ Platinum Hit ・ Platinum Hits ・ Platinum Hits (Candyman album) ・ Platinum Hits (disambiguation) ・ Platinum Hook ・ Platinum in Africa ・ Platinum in da Ghetto ・ Platinum Jazz ・ Platinum jubilee ・ Platinum Jubilee High School, Warangal ・ Platinum Koala Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Platinum group ： ウィキペディア英語版 Platinum group The platinum-group metals (abbreviated as the PGMs; alternatively, the platinoids, platinides, platidises, platinum group, platinum metals, platinum family or platinum-group elements (PGEs)) are six precious metallic elements clustered together in the periodic table. These elements are all transition metals in the d-block (groups 8, 9, and 10, periods 5 and 6). The six platinum-group metals are ruthenium, rhodium, palladium, osmium, iridium, and platinum. They have similar physical and chemical properties, and tend to occur together in the same mineral deposits. However they can be further subdivided into the iridium-group platinum-group elements (IPGEs: Os, Ir, Ru) and the palladium-group platinum-group elements (PPGEs: Rh, Pt, Pd) based on their behaviour in geological systems. == History == Naturally occurring platinum and platinum-rich alloys have been known by pre-Columbian Americans for many years. Though the metal was used by pre-Columbian peoples, the first European reference to platinum appears in 1557 in the writings of the Italian humanist Julius Caesar Scaliger (1484–1558) as a description of a mysterious metal found in Central American mines between Darién (Panama) and Mexico ("up until now impossible to melt by any of the Spanish arts").〔 The Spaniards named the metal ''platina'' ("little silver") when they first encountered it in Colombia. They regarded platinum as an unwanted impurity in the silver they were mining.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Platinum group」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.