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jan 1, 1864 - John Newlands (1864) Proposed classifying the elements in order of increasing atomic weights and were grouped similarly to today's 7 groups (e.g Alkali Metals, Metalloids, ect.)
Added to timeline:
Periodic Table timeline
By
Callum
30 Jul 2021
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0
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Date:
jan 1, 1864
Now
~ 162 years ago
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