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1 фев 1897 г. - 1896 AD: Frederick Soddy, a radio-chemist who worked in nuclear chemistry studied the 1896 radioactivity phenomenon and he discovered after a chain of experiments that atoms could have the same chemical properties but can change those properties when it came to radioactivity. In 1913 Soddy claimed a new theory that atoms can have isotopes that change its weight.

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1 фев 1897 г.
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