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Question
Why was Dobereiner's triad discarded?
Solution
Döbereiner failed to arrange all the known elements in the form of triads.
In the triad of fluorine (19), chlorine (35.5) and bromine (80), it is observed that the mean of the atomic masses of fluorine and bromine is ½(19 + 80) = 49.5, not 35.5.
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Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
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