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Isotopes were not invented - they exist in nature. They were discovered when the Atomic Mass of Chlorine was measured at 35.5

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Who is jj tompson?

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Henri Bacquerel first experimented with phosphorescent materials and discovered radioactivity. The Curies and Ernest Rutherford later experimented with it. -------------------------------------------------- The first hypothesis on isotopes is from Frederick Soddy (1912); the practical confirmation is attributed to J. J. Thomson (1913). Henri Becquerel discovered the phenomenon of radioactivity studying uranium salts.


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