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actinide |
Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson | 0.04 sec. |
actinideAny of the series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). All are radioactive heavy metals; and only the first four (actinium, thorium, protactinium, and uranium) occur in nature in appreciable quantities. The other 11 (the transuranium elements) are unstable and are produced only artificially. Actinides are transition elements, so their atoms have similar configurations and similar physical and chemical behaviour; the most usual valences are 3 and 4. |
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? Mentioned in | ? References in periodicals archive | ||
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| The emphasis of this announcement is on the
ions, complexes, and organometallic compounds of the transition metals
known as lanthanides and actinides, post-transition metals, and
metalloid elements. Vaseline glass is mildly
radioactive, a property shared by all of the actinide elements, but the
mystery element was banned for use as a coloring agent in the 1940s. Wong synthesized the first known
lanthanide and actinide porphyrin complexes. |
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actinide
