Multiple choice

Which of the following elements is not a part of any of Dobereiner’s triads?

  1. K

  2. F

  3. Cl

  4. I
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B Correct answer
Explanation

According to Dobereiner, when elements of a given triad are arranged on the basis of increasing atomic masses, the atomic mass of the middle element is roughly the mean or average of the atomic masses of the other two elements. Dobereiner gave only three traids - (Li, Na, K); (Cl, Br, I) and (Ca, Sr, Ba).

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