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Chapter 21 Sixth main group of the periodic table

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Chapter 16 First main group of the periodic table

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Chapter 17 Second main group of the periodic table

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Chapter 23 Eighth main group of the periodic table

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Chapter 19 Fourth main group of the periodic table

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Chapter 22 Seventh main group of the periodic table

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Chapter 18 Third main group of the periodic table

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Нулевые период и группа периодической таблицы Менделеева - Zero period and group of the periodic table

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