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акти́ний

actinium

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For example, the alpha-decay of uranium-235 forms thorium-231, while the beta decay of actinium-230 forms thorium-230. en.wikipedia.org

Actinium is mostly present in uranium-containing, but also in other minerals, though in much smaller quantities. en.wikipedia.org

Actinium-225 is less available than actinium-228, but is more promising in radiotracer applications. en.wikipedia.org

The new name meant parent of actinium and reflected the fact that actinium is a product of radioactive decay of protactinium. en.wikipedia.org

The most abundant, or easy to synthesize actinides are uranium and thorium, followed by plutonium, americium, actinium, protactinium and neptunium. en.wikipedia.org

All actinides are radioactive, paramagnetic, and, with the exception of actinium, have several crystalline phases: plutonium has seven, and uranium, neptunium and californium three. en.wikipedia.org

The actinide series comprises the elements from actinium to lawrencium. en.wikipedia.org

This research resulted in the successful identification of a new element in the decay chain between uranium-235 and actinium, later named protactinium. en.wikipedia.org

A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. en.wikipedia.org

Actinium has similar chemical properties as lanthanum and other lanthanides, and therefore these elements are difficult to separate when extracting from uranium ores. en.wikipedia.org

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