Where Does the Word Actinide Come from?

The actinoid /ˈæktɪnɔɪd/ (IUPAC nomenclature, also called actinide /ˈæktɪnaɪd/) series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. The actinoid series derives its name from the first element in the series, actinium.

Where did the name actinide come from?

Actinides are the 15 elements with atomic numbers from 89 to 103. They are named after the first element in the series, actinium.

What is meant by actinoid?

1 : resembling a ray especially of a radially symmetrical animal. 2 : exhibiting radial symmetry. actinoid. noun. ac·​ti·​noid | \ ˈak-tə-ˌnȯid \