What is traid? Give an example?
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Dobereiner's Triad - definition
He found that the atomic mass of the middle element was approximately equal to the arithmetic mean (average) of the atomic masses of the other two elements of that triad when they are arranged in their increasing order of atomic mass, e.g., Li, Na, K.
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traid is a group of 3 people or thing example of traid is 2 brothers and 2 sisters
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