Classification of rare earths 1) Light rare earth (also known as 铈 group): 镧 , 铈, 镨 , é’• , é’·, é’ , é“• , é’† . 2) Heavy rare earth (also known as é’‡ group): 铽 , é• , é’¬ , é“’ , é“¥ , 镱 , é•¥ , é’ª , é’‡. The difference between the 铈 group and the é’‡ group is because the rare earth mixture obtained by separation of minerals is often named after the ratio of lanthanum or cerium. Rare earth metals (rare earth metals), also known as a rare earth element, is a general term for a group â…¢B periodic table scandium, yttrium, lanthanides 17 elements, commonly represented by R or RE. Their names and chemical symbols are é’ª (Sc), é’‡ (Y), 镧 (La), 铈 (Ce), 镨 (Pr), é’• (Nd), é’· (Pm), é’ (Sm), é“• (Eu ), Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu. Their atomic numbers are 21 (Sc), 39 (Y), 57 (La) to 71 (Lu). The element “Ce†“铈†was discovered and named by the German Claupros, Swede Usbizzi, and Singel in 1803 to commemorate the asteroid, Ceres, discovered in 1801.
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