Actinides

Japanese: actinides
Actinides

...A general term for 15 elements ranging from actinium (Ac) (atomic number 89) to lawrencium (Lr) (atomic number 103) in the periodic table. The 14 elements excluding actinium are sometimes called actinides. All of them are radioactive, and the elements below neptunium (Np) (atomic number 93) are artificial.

*Some of the terminology that mentions "actinides" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…周期表原子番号89番のアクチニウムAcから103番のローレンシウムLrに至る15元素の総称。このうちアクチニウムを除いた14元素をアクチニドactinidesと呼ぶこともある。すべて放射性で,93番のネプツニウムNp以下は人工の元素である。…

※「actinides」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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