What are Dobereiner’s triads? Give example of 2 triads.

What are Dobereiner’s triads? Give example of 2 triads.
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Ans: he arranged the elements in several sets of 3 elements .these sets were called triads which resembled with each other in chemical properties and atomic mass of the middle element was approx the mean of the atomic masses of the remaining two.
Example (i) chlorine, bromine and iodine A.T of cl =35.5 and iodine =127 .middle element bromine has (35.5 +127)/2 =81.25
(ii) Calcium (40) ,strontium(88.5) and barium (137)
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