Respuesta :
Trade of elements with similar properties: strontium, calcium, and barium. Dobereiner organized elements according to atomic mass and by adding of 1st and 3rd number element atomic mass their average will be nearly the same as the atomic mass of the 2nd one.
What are triads?
These traits are given by scientists for a better understanding concept of the arrangement of the elements and basses of their masses
According to this trade, he introduces 3 triads by adding the atomic mass of 1st and 3rd elements their average will be the
same or nearly the same as the atomic mass of the second one.
These are helpful to better understand the numbering of elements but due to some major drawbacks this system is not followed by anyone today that is what has a modern periodic table for better understanding of things
Therefore, the 3 trades which are introduced by him are strontium, calcium, and barium.
Learn more about dobereiner traids, here:
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