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She had hypothesized that the emission of rays by uranium compounds could be an atomic property of the element uranium--something built into the very structure of its atoms, which proved to be a correct hypothesis. Her hypothesis contributed to a fundamental shift in scientific understanding. Curie conducted many experiments during the 1890s to determine if other elements or minerals would make air conduct electricity better, or if uranium alone could do this. Her research in April, 1898, revealed that thorium compounds, like those of uranium, emit Becquerel rays. After this experiment, she invented the term "radioactivity", based on the Latin word for "ray"...
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