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Actinide chemistry : ウィキペディア英語版 | Actinide chemistry
Actinide chemistry or Actinides chemistry is one of the main branches of nuclear chemistry that investigates the processes and molecular systems of the actinides. The actinides chemistry derives its name from the group 3 element actinium. The informal chemical symbol An is used in general discussions of actinide chemistry to refer to any actinide. All but one of the actinides are f-block elements, corresponding to the filling of the 5f electron shell; lawrencium, a d-block element, is also generally considered an actinide. In comparison with the lanthanides, also mostly f-block elements, the actinides show much more variable valence. The actinide series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium.〔(Actinide element ), Encyclopædia Britannica on-line〕〔Although "actinoid" (rather than "actinide") means "actinium-like" and therefore should exclude actinium, that element is usually included in the series.〕 ==Main branches==
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