| 单词 | lanthanide contraction |
| 释义 | > as lemmaslanthanide contraction lanthanide contraction n. [translating German lanthanidenkontraktion (V. M. Goldschmidt et al. 1925, in Skrifter Norske Vidensk.-Akad. (Mat.-nat. Kl.) vii. 13)] the decrease in atomic and ionic radii with increasing atomic number observed in the lanthanide series. ΚΠ 1926 Chem. Abstr. 20 131 ‘Lanthanide contraction’ is the term applied to the volume contraction of the atoms in the rare earth series Ce–Cu [sic]. This contraction opposes the progressive increase of at. vol. in each vertical column of the periodic table. 1945 A. F. Wells Structural Inorg. Chem. iii. 94 As a result of this ‘lanthanide contraction’, so called because it is observed in the elements following lanthanum, certain pairs of elements in the same Periodic Group have practically identical ionic (and atomic) radii. 1971 Jrnl. Inorg. & Nuclear Chem. 33 385 The lanthanide contraction as reflected in certain properties of the lanthanide compounds is not a smooth function of Z. < as lemmas |
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