Explain the dobereiner's attempt.
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Dobereiner's triads were groups of elements with similar properties that were identified by the German chemist Johann Wolfgang Dobereiner. He observed that groups of three elements (triads) could be formed in which all the elements shared similar physical and chemical properties.
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Dobereiner gave an idea of classification of elements in the form of triads. ... It means that when the elements are arranged in order of increasing atomic masses, the elements with similar properties recur at regular intervals.
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