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This doesn't work for six elements, however. These being: iron, manganese, nickel, cobalt, zinc and copper (1 янв 1817 г. – 23 ч 59 мин, 31 дек 1817 г.)

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Key Scientists in the construction of the periodic timetable

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1 янв 1817 г.

23 ч 59 мин, 31 дек 1817 г.

~ 12 months

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