Question

what is the first atempt of classification of elements . (I) metals and non metals or (2)dobereiners traids​

Answer 1

Explanation:

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Answer 2

dobereiner's triads was done for classifying the elements but he knew that he have to classify metals and nonmetals and metalloids. it means that metals and nonmetals were discovered and a classified first and then after Dobereiner's triads was discovered but then also that classification was a contradiction it means it was wrong.

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