Question

Lithium, sodium and constitude a dobereiners traid​

Answer 1

Answer:

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Lithium, sodium and potassium constitute a Dobereiner's triad. Dobereiner paired elements in group of three such that atomic mass of middle element was the average of 1st & 3rd element. For example, mass of Na (A=23) is average of Li (A=7) and K (A=39).