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14 h 24 m, 1 ene 1900 año - Early 1900s: Lanthanides were finally understood. Actinides were discovered.
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 1900 año
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~ 124 years ago
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