Answer :

When elements are arranged in oder of their atomic masses then the average of first and third element atomic masses is equal to the atomic mass of second element.

For example- In alkaline earth metals group the first element is beryllium, the middle element is magnesium and the third element is calcium, so acc. To the Debereiner’s triad the arithmetic mean of the atomic masses beryllium and calcium is equal to the atomic mass of magnesium.


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