bn:00001100n
Noun Concept
Categories: Pages that use a deprecated format of the chem tags, Periodic table, Actinides
EN
actinide  actinoid  actinon  actinides  Actinide element
EN
Any of a series of radioactive elements with atomic numbers 89 through 103 WordNet 3.0
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EN
Any of a series of radioactive elements with atomic numbers 89 through 103 WordNet 3.0 & WordNet 2020
The actinoid series encompasses the 15 metallic chemical elements with atomic numbers from 89 to 103, actinium through lawrencium. Wikipedia
F-block chemical elements Wikidata
An element member of the actinide group of 15 radioactive elements. OmegaWiki
A group of 15 radioactive elements some of which occur naturally while others are produced in nuclear reactions. They include plutonium, americium and neptunium. The health hazard presented by the actinides, if they are released into the environment, comes from the potency of their radioactive characteristics. They are alpha-emitters, and therefore can cause intense localized damage in tissues if absorbed into the body. OmegaWiki
Any of the 14 radioactive elements of the periodic table that are positioned under the lanthanides, to which they have similar chemistry. Wiktionary
One of a group of radioactive elements. Wiktionary (translation)