Write a note on Dobereiner's triad: Be (9.0), Mg (24.3), Ca (40.1)

Ans. In a Dobereiner's triad, the atomic mass of the middle element is approximately equal to the mean of the atomic masses of the other two elements.

This is equal to the actual atomic mass of Mg.
Hence elements Be, Mg and Ca form a Dobereiner's triad.

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