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what are merits and demerits of johann wolfgang dobereiner????

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i merit is he was accurate
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The only of merit Dobereiner's research was that it made chemists look at elements in terms of groups of elements with similar chemical and physical properties. This eventually led to rigorous classification of elements and the modern periodic table of elements

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Merits of Dobereiner's triads :-
1) He was the 1st person who tried to classify elements on the basis of atomic mass.
2) His research made chemists look at different elements in terms of group of elements with similar chemical and             physical properties, This gradually led to rigorous classification of elements by different chemists.

De- Merits of Dobereiner's triads:-
1) All the elements known that day couldn't be arranged in the form of triads.
2) He could form only 3 triads.
3) His law was applicable only to low atomic mass elements..

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