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actinide

From: Encyclopedia Britannica | Date: 2007 | Copyright information

Any 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.For more information on actinide, visit Britannica.com.

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	actinide series Book article from: The Columbia Encyclopedia, Sixth Edition ...Members of the series are often called actinides, although actinium (at. no. 89) is not...lawrencium . Thorium and uranium are the only actinides found in the earth's crust in appreciable...elements ). Study of the properties of the actinides is hampered by their radioactive instability... Read more
	actinide Book article from: The Oxford Pocket Dictionary of Current English ac·ti·nide / ˈaktəˌnīd / • n. Chem. any of the series of fifteen metallic elements from actinium (atomic number 89) to lawrencium (atomic number 103) in the periodic table. They are all radioactive, the heavier members being extremely unstable and not of Read more
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