There are many exceptions to this rule, however, including iron being put in the same group as sulfur and oxygen - explaining why it was disregarded by other scientists (1 янв 1864 г. – 23 ч 59 мин, 31 дек 1864 г.)
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1 янв 1864 г.
23 ч 59 мин, 31 дек 1864 г.
~ 12 months