when periodic table was started and were
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In 1869 Russian chemist Dimitri Mendeleevstarted the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in hisperiodic table for them. In 1886 French physicist Antoine Bequerel first discovered radioactivity.
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the period doc table was started in 1869 Russian chemist dimitri Mendeleev started it
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