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This doesn't work for six elements, however. These being: iron, manganese, nickel, cobalt, zinc and copper (jan 1, 1817 – 23h 59min, dec 31, 1817 y)

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Key Scientists in the construction of the periodic timetable

28 Nov 2018

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Date:

jan 1, 1817

23h 59min, dec 31, 1817 y

~ 12 months

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