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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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24 agos 1914 año - H.G.J. Moseley discovered that the number of protons in an element determines its atomic number.
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Tommy Worcester
27 sep 2017
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24 agos 1914 año
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~ 111 years ago
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