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#chemical element #unstable #short half-life #radioactive decay #halogen group #element 85

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#synthetic element #unstable #short half-life #man-made 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