The density and specific heat of rare earth metals
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In the periodic table of the elements includes an unusual block of two rows of elements located below the main body of the chart. These elements, and lanthanum (element 57) and actinium (element 89), known together as rare earth elements or rare earth metals. In fact, they are not particularly rare, but prior to 1945, to clean metals from their oxides required a long and laborious e processes
Today for fast production of high-purity, low-cost rare earth elements are used in the processes of ion exchange and solvent extraction, but the old name is still in use. Rare earth metals are found in group 3 of the periodic table, the 6th (5d electronic configuration) and 7th (5f electronic configuration) periods. There are two blocks of rare earth elements: lanthanides series and actinides series. However, some chemists exclude lanthanum and actinium from the rare earths, considering the lanthanides begin to follow after lanthanum and actinides.
In a sense the rare earths are special transition metals, possessing many of the properties of these elements.
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These General properties apply to both the lanthanides and the actinides.
Rare earth — silver, silver-white or gray metals. Metals have high luster, but easily come close to the air. Metals have high electrical conductivity.
The rare earths share many common properties. This creates particular difficulties in order to separate or even distinguish from each other. There are very small differences in solubility and complex formation between the rare-earth elements.
Rare earth metals naturally occur together in minerals (e.g., monazite is a mixed rare earth phosphate).
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