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Chemie (Subject) / PSE (Lesson)

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• 1 Hauptgruppe Alkaliemetalle H wasserstoff 1 Li  Litzium  3 Na natrium 11 K kalium 19
• 2 Hauptgruppe ERDALKALIMETALLE   Be   Beryllium   4 Mg   Magnesium 12  Ca  Calzium 20

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