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1 jan 1864 ano - 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.)

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Periodic Table timeline

ByCallum
30 jul 2021
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1 jan 1864 ano
Agora
~ 161 years ago
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