The three elements A, B and C with similar properties have atomic mass – InterviewSolution

1.	The 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 as? Give one example of such a set of elements.
Answer» The arrangement of these elements is known as Dobereiner & triad. Example, Lithium, Sodium and Potassium.

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