Question

What was the Dobereiner's concept?
Up to 5 marker answer. ​

Answer 1

Answer:

Dobereiner's concept

The appearance and reactions of the elements in a triad were similar to each other. Dobereiners law of triads states that when three elements are taken in increasing order of atomic masses then the average of the atomic masses first and third element is equal to the atomic mass of the middle element.

Answer 2

Answer:

In 1803, Dalton gave information about atomic masses of the element. At that time the known element were classified on the basis of their atomic masses.

In 1817,German Scientist Dobereiner started classifying elements on the basis of their chemical properties. He mentioned the trains of the elements having similar chemical properties.

If the three elements are arranged in their increasing order of atomic masses,the atomic masses of intermediate element was similar to average atomic masses of first and third elements.

More than three elements having similar properties can be classified through Dobereiner's triad of the elements. Because of the limited number of elements classified by this method,it didn't succeed.

Flourine can be added to the triads of chlorine,bromine and iodine .Similarly magnesium can be added to the traid of calcium, strontium and barium.

Hence the possibility of group arose instead of triads.

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