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AIzaSyB4mHJ5NPEv-XzF7P6NDYXjlkCWaeKw5bc
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1 ene 1869 año - A total of 63 elements had been discovered. Scientists, started to notice patterns in the element's properties.
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Periodic Table Timeline
By
Jessica Maeda
16 dic 2017
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1 ene 1869 año
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~ 156 years ago
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