actinide

English dictionary entry

Meanings

noun

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.
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).
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).

ăk'tĭnīd /ˈæktɪnaɪd/ LL-Q1860 (eng)-Vealhurl-actinide.wav

actinide actinides

From actin- + -ide.

actinium thorium protactinium uranium neptunium plutonium americium curium berkelium californium einsteinium fermium mendelevium nobelium lawrencium

actinidic nonactinide organoactinide radioactinide superactinide transactinide

This entry uses open data from Wiktionary (CC BY-SA/GFDL). Word forms are used for search and are not indexed as separate pages.

Back to search All on A Russian dictionary Dahl dictionary