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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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27 jul 1919 ano - Francis William Aston used a mass spectrograph to identify 212 isotopes.
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By
Saisriram Sanjai
15 mai 2018
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313
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27 jul 1919 ano
Agora
~ 106 years ago
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