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14 h 24 m, 1 ene 1898 año - Ramsay discovered two more noble gases, Krypton and Xenon
Añadido al timeline:
Periodic Table Timeline
By
Kimira B
14 dic 2017
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0
493
fecha:
14 h 24 m, 1 ene 1898 año
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~ 126 years ago
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