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14 h 24 m, 1 jan 1900 ano - Early 1900s: Lanthanides were finally understood. Actinides were discovered.
Adicionado na linha do tempo:
Periodic Table Timeline
By
Kimira B
14 dez 2017
0
0
493
Data:
14 h 24 m, 1 jan 1900 ano
Agora
~ 124 years ago
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