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1 Jan 1917 Jahr - Clasificacion de los elementos

Beschreibung:

Entre 1917 y 1929, el químico alemán Johan Dobereiner clasificó a algunos elementos en grupos de tres denominados triadas, ya que tenían propiedades químicas similares.

Zugefügt zum Band der Zeit:

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Bysamuel santa
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1 Jan 1917 Jahr
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~ 108 years ago
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