Question

state donerneir law of trait​

Answer 1

Answer:

Dobereiner made groups of there elements each, having similar chemical properties and called them triads. He arranged the three elements in a triad in an increasing order of atomic mass and showed that the atomic mass of the middle element was approximately equal to the mean of the atomic masses of the other elements.

Answer 2

Element:-

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Element are pure substance made up of one type of atom . There are the basic unit of all type of matter in order to study elements in an organised manner they need to be classified .

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Döbereiner Triads :-

Döbereiner grouped the elements in 3 triads. All the three tribes has similar property that the atomic weight of the middle element was the arithmetic mean of the two other.

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Example :-

1. Ca , Sr ,Ba
2. Cl, Br, I

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