Soft silver-white metal, malleable. Chemically active. Soluble in dilute acid. It is easily oxidized in the air; heating can burn to form oxides and nitrides. Heating in hydrogen produces hydride which is strongly reflected in hot water and releases hydrogen. Lanthanum is present in monazite sand and bastnasite in. Element source: The preparation of hydrazine is generally obtained by dehydration of hydrated cerium chloride, reduction with metallic calcium, or electrolysis of anhydrous cerium chloride by melting and electrolysis. It quickly loses its luster in humid air, producing a colorless compound, which is found in rare earth minerals. It is usually classified into rare earths and is a major component of mixed rare earths. Element use: It can be alloyed or used as a catalyst. Therefore, it is often used to manufacture expensive camera lenses.镧138 is radioactive with a half-life of 1.1×1011 years and was tested to treat cancer. Elemental auxiliary materials: After the discovery of 铈 and 钇 , although some chemists realized that they were not pure elements, it was not until they were discovered about 40 years later that the mystery was solved by the patient analysis of Swedish chemist Mosandel and others. Mosandel is a student and assistant to Bezilius who has made a significant contribution to the discovery and study of rare earth elements. In 1839 he heat-decomposed cerium nitrate and found that only a part of it was dissolved in nitric acid. He called the dissolved oxide a lanthana, the element called lanthanum (镧), and the element symbol is La, from the Greek lanthanŠ("hidden"). 镧 and the subsequent discovery of 铒 and 铽 opened the second door to the discovery of rare earth elements, the second stage of the discovery of rare earth elements. Their discovery is to find three of the rare earth elements after the two elements of 铈 and 钇. Decaf Green Tea,Organic Matcha,Iced Matcha,Loose Leaf Green Tea Hunan Junshan Yinzhen Tea Industry Co.,Ltd , https://www.junshan-tea.com