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Which of the following is correct w.r.t. Dobereiner triads?

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Atomic masses of elements differ by one to five unit only

It was only for metals

Elements of Dobereiner triad belong to the same group

It forms a group of three elements

answer is A.

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Detailed Solution

Dobereiner triad is a group of three elements in which the atomic weight and properties of the middle element is the average of other two elements.

Ex: (1) Li , Na , K

(2) ca , Sr , Ba

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