Awkward discovery history

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Lanthanum is a rare earth metal of. Rare earths are the names left over from history and have been discovered since the end of the 18th century. When people are accustomed to the water-insoluble solid oxide referred to the soil, for example, it is called the clay alumina, magnesium oxide complain soil. Rare earths are separated by oxides and are rare. Therefore, they are named rare earths. The atomic number of rare earth elements is 21 ( Sc ), 39 ( Y ), 57 ( La ) to 71 ( Lu ). Their chemical properties are very similar, which is determined by the characteristics of the extranuclear electronic structure. They generally all form trivalent compounds. Scandium and other rare earth chemical properties significantly different, rare-earth minerals generally contain scandium. Promethium was obtained from uranium fission products in the reactor, 147Pm radioactive half-life of 2.7 years. Promethium past that does not exist in nature, until 1965, the Netherlands in a phosphate processing plant apatite, promethium only to find a trace ingredients. Therefore, in 1968 , China was classified as 64 non-ferrous metals. In 1787 , the Swedish Alenis ( CAArrhenius ) found an unusual black ore in the small town of Ytterby near Stockholm . 1794 Finnish chemist Gadolin (J.Gadolin) studied this mineral, isolated a new substance from which, three years later (1797), Swede Aikeboge (AGEkeberg) confirmed this They found, and to discover new names to the substance named Ytteia (yttrium earth). Later, to commemorate Gadolin, called this ore is Gadolinite (Gadolin mine, that gadolinite). In 1803 the German chemist carat Puluo Zi (MHKlaproth) and the Swedish chemist Bai Qi Li Aspen (JJBerzelius) and Siegel Xi Health (W.Hisinger) simultaneously found another new substance --- ceria (ceria) from another ore (ore silicon cerium) in. 1839 Swede Mozambique in Seoul (CGMosander) found that a mixture of lanthanum and neodymium praseodymium (didymium). 1885 Austrian Wisconsin Barker (AVWelsbach) from Mozambique in Seoul, believed to be a mixture of neodymium praseodymium "new elements" found praseodymium and neodymium. 1879 French布瓦普德朗(LDBoisbauder) found samarium. 1901 French Demar game (EADemarcay) found europium. 1880 Switzerland Marley ng (JCGDe Marignac) found gadolinium. In 1843 Mozambir discovered 铽 and 铒 . 1886布瓦普德朗found dysprosium. 1879 Swede Cliff (PTCleve) discovered holmium and thulium. In 1974 , Americans such as JAMarisky obtained bismuth from uranium cracking products. In 1879 , the Swedish Neilson ( LFNilson ) discovered the cockroach . From 1794 , Gadolin separated the bauxite to 1947 , which lasted for more than 150 years.

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