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Three elements A, B and C with similar p...

Three elements A, B and C with similar properties have atomic masses X,Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called? Give one example of such a set of elements.

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The arrangement of these elements is known as Dobereiner.s triad. E.g one set of triad is lithium, sodium and potassium
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