Word: actinium
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Dates: during 1940-1949
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...close relative of uranium, thorium is another radioactive, heavy element (atomic number 90, atomic weight 232.12) that disintegrates into lower-weight elements and eventually becomes lead. Of the three standard radioactive progressions - uranium-radium, actinium and thorium-those of uranium and thorium are the most alike. According to the Smyth report, thorium was considered as a basic source of atomic power, but uranium was chosen instead...
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