Question

State Dobereiners Triads with Suit
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Answer 1

Dobereiner's Triads are groups of three elements arranged in such a way that the atomic weight of the middle element is almost the average of the other two. The elements of triad have almost similar properties.
For example, consider Li,Na and K with atomic weights 7,23 and 39 g/mol respectively.
2
7+39
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=23
The atomic weight of Na is almost the average of the atomic weights of Li and K. Other examples include
(i) Ca(40),Sr(88) and Ba(137)
(ii) Cl(35.5),Br(80) and I(127).



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