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14 h 23 m, 1 ene 1886 año - All three missing elements are discovered (Scandium, Gallium, Germanium)
Añadido al timeline:
Periodic Table Timeline
By
Kimira B
14 dic 2017
0
0
492
fecha:
14 h 23 m, 1 ene 1886 año
Ahora mismo
~ 138 years ago
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