actinide

Meaning

1. 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. 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. (dated) 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).

Synonyms

actinoid

actinon

actinides

Translations

actinide

aktinit

actínido

actínid

attinide

actinide

Actinoid

أكتينيد

actinídio

Actinoide

attinido

actinídeo

ακτινίδες

Pronounced as (IPA)

/ˈæktɪnaɪd/

Etymology

From actin- + -ide.