actinide

Noun

 * 1) (chemistry) Any of the 15 radioactive elements of the periodic table from actinium to lawrencium that are positioned under the lanthanides, to which they have similar chemistry.
 * 2) (chemistry) Any of the 14 elements from actinium to nobelium (lawrencium is excluded by some authors as it is a d-block rather than an f-block element).
 * 3) (chemistry)  Any of the 14 elements from thorium to lawrencium (actinium having been mistakenly excluded because it was thought to be a d-block element in the past).

Translations

 * Afrikaans:
 * Catalan: actínid
 * Chinese:
 * Mandarin:
 * Czech: aktinid,
 * Finnish:
 * Greek:
 * Hindi: एजातेय
 * Hungarian:
 * Italian: attinoide
 * Japanese:
 * Polish:
 * Romanian: actinid
 * Serbo-Croatian:
 * Cyrillic: актинид
 * Roman: aktinid
 * Spanish: