Multiple choice

According to Dobereiner’s law, the atomic masses of the middle elements were equal to the

  1. sum of the atomic masses of the other two elements

  2. arithmetic mean of the atomic masses of the other two elements

  3. atomic mass of the first element of the same group

  4. atomic mass of the last element of the same group
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B Correct answer
Explanation

The elements of the triads had similar properties and when arranged in the increasing order of atomic masses, the atomic mass of the middle element was roughly the arithmetic mean of the masses of the other two elements.

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