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which had been discovered only eight years earlier.Klaproth was able to precipitate a yellow compound (likely sodium diuranate) by dissolving pitchblende in nitric acid and neutralizing the solution with sodium hydroxide.Of the actinides, primordial thorium and uranium occur naturally in substantial quantities.
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Uranium and thorium also have diverse current or historical uses, and americium is used in the ionization chambers of most modern smoke detectors.The prevailing view that dominated early research into transuranics was that they were regular elements in the 7th period, with thorium, protactinium and uranium corresponding to 6th-period hafnium, tantalum and tungsten, respectively.Synthesis of transuranics gradually undermined this point of view.While actinium and the late actinides (from americium onwards) behave similarly to the lanthanides, the elements thorium, protactinium, and uranium are much more similar to transition metals in their chemistry, with neptunium and plutonium occupying an intermediate position.
All actinides are radioactive and release energy upon radioactive decay; naturally occurring uranium and thorium, and synthetically produced plutonium are the most abundant actinides on Earth.
He also isolated the first sample of uranium metal by heating uranium tetrachloride with metallic potassium.
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