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出典:『Wikipedia』 (2011/05/07 13:17 UTC 版)

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The f-block of the periodic table of the elements consists of those elements whose atoms or ions have valence electrons in f-orbitals. Actual electronic configurations may be slightly different from what is predicted by the Aufbau principle. The elements are also known as inner transition elements, although that term is normally taken to include lutetium and lawrencium as well, which are part of the d-block. There are two series. Elements of the series in which the electrons are in 4f orbitals belong to the lanthanide series. Elements of the series in which the electrons are in 5f orbitals belong to the actinide series.