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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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17 feb 1912 año - -Frederick Soddy was an English chemist who in 1912, hypothesised that elements could exist in different forms, proposing the idea of isotopes.
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De-Hong Wong
15 oct 2017
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17 feb 1912 año
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~ 113 years ago
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