Multiple choice

In Döbereiner’s triads, the elements were placed in the increasing order of their

  1. atomic masses

  2. reactivity

  3. number of protons

  4. number of neutrons

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A Correct answer
Explanation

According to Döbereiner, when elements of any particular triad were arranged in the increasing order of their atomic masses, the mass of the middle element was roughly the mean or average of the atomic masses of the other two elements.