Dobereiner laid down the ______ rule.

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Dobereiner laid down the triad rule. Explanation Johann Wolfgang Döbereiner proposed the Law of Triads in 1817. According to this rule, when elements with similar properties are arranged in a group of three (called a triad) in increasing order of their atomic masses, the atomic mass of the middle element is approximately the arithmetic mean of the atomic masses of the other two elements.

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