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• 21:57, 11 August 2025 Kkmurray talk contribs created page Thomson 1904/Chapter 6 (Created page with "==CHAPTER VI== RADIO-ACTIVITY AND RADIO-ACTIVE SUBSTANCES IN 1896 Becquerel discovered that uranium and its salts possess the power of giving out rays which, like Rontgen and cathode rays, affect a photographic plate, and make a gas through which they pass a conductor of electricity. In 1898 Schmidt discovered that thorium possesses similar properties. This power of emitting rays is called radio-activity, and substances which possess the power are said to be radio-acti...")