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#radioactivity #unstable element #uranium #plutonium

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#unstable element #radioactive decay #element symbol #at #element 85 #astatos

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#technetium #element 43 #radioactive element #atomic number 43 #tc-43 #unstable element

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#radionuclide #radioactivity #radiation energy #decay event #high energy #unstable element

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#francium #FR #alkali metal #radioactive alkali metal #short half-life #unstable element #group 1 element

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#francium #FR #radioactive #unstable element #rare element #fleeting element #short half-life #radioactivity