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Noun, Noun or verb acting prenominally
1. actinide (family of elements); actinides; actinoidChemistry
Wikipedia definition
2. ActinideThe actinide or actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The actinide series derives its name from the group 3 element actinium. 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.
Read “Actinide” on English Wikipedia
Read “アクチノイド” on Japanese Wikipedia
Read “Actinide” on DBpedia
Other forms
アクチナイドアクチノイド

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