RE
rare earth (element)
希土(類)(元素). ランタニド.
rare earth (element); or REE(rare earth element); or rare earth atoms; or lanthanides; or REI(rare-earth ion); 17 atoms (at.no., at.wt.) are; Sc(21, 44.9559), Y(39, 88.9059), La (57, 138.905), Ce (58, 140.12), Pr (59, 140.9077), Nd (
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