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稀土元素
释义
稀土元素
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理学
稀土元素
释
rare earth element
稀土元素
元素周期表ⅢB族中原子序数为21、39和57~71的17种化学元素的总称。稀土元素的化学符号用RE代表。又称稀土金属。包括钪Sc、钇Y、镧La、铈Ce、镨Pr、钕Nd、钷Pm、钐Sm、铕Eu、钆Gd、铽Tb、镝Dy、钬Ho、铒Er、铥Tm、镱Yb、镥Lu。其中57~71号元素称为镧系元素,位于元素周期表最下方的f区。从镧到铕为铈组(轻稀土),从钆到镥及钇为钇组(重稀土)。
Astronomy
rare-earth element
稀土元素
Chemistry
>无机化学>无机化学基本概念与无机化合物>释义
rare earth element
稀土元素
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homomorphism of chain complexes
homomorphism of graphs
homomorphism of group objects
homomorphism of groups
homomorphism of homology theories
homomorphism of languages
homomorphism of Lie algebras
homomorphism of Lie groups
homomorphism of measure spaces
homomorphism of modules
homomorphism of ordered sets
homomorphism of polygons
homomorphism of presheaves
homomorphism of rings
homomorphism of semigroups
homomorphism of sheaves
homomorphism of structures
homomorphism of topalogical groups
homomorphism of topological groups
homomorphism of vector spaces
homomorphism theorem
homomorphous
homomorphous group
homomorphous mapping
homomorphy
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