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The three elements A, B and C with simil...

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

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The arrangement is known as Dobereiner's triad. For example. Calcium (Ca), Strontium (Sr) and Barium (Ba). For more details, consult section 5.2.
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