Question

What is the triads of dobereiners ?

Answer 1

Dobernier classified the elements into groups of three elements with similar properties in such a manner so that the atomic weight of the middle element was the arithmetic mean of the other two,e.g.

Element Li. Na. K

Atomic wt. 7. 23. 39

Mean of atomic masses = 7+39/2=23

Similarly Cl,Br,I ; Ca,Sr,Ba are two more examples of such traids.

Limitations: Dobernier could not arrange all the elements known at that time into traids.He could identify only three such traids that have been mentioned.

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Answer 2

Explanation:

Answer

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