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प्रश्न
Why was Dobereiner's triad discarded?
टिप्पणी लिखिए
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उत्तर
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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