Periodensystem - 1 1 2 2 3 3 4 4 5 5 6 6 7 7 6 7 2 - II a 13 - III a 14 ...

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This is an Open Educational Resource (OER) provided by the GFE Foundation. It is a supplementary asset for the document 1 2 2 3 . Feel free to use this material in your classrooms and presentations.