actinide

(aktə nīd′)

noun

any of the elements in the series () of radioactive, metallic chemical elements from element 89 (actinium) through element 103 (lawrencium): actinides resemble lanthanides in electronic structure

Origin: < actin(ium) + -ide

See actinide in American Heritage Dictionary 4

noun
Any of a series of chemically similar, radioactive elements with atomic numbers ranging from 89 (actinium) through 103 (lawrencium).

Origin:

Origin: actin(ium)

Origin: + -ide

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