Question

Does beryllium magnesium and calcium form dobernairs triad?

Answer 1

Approximately it can form triads.
Because the average of atomic masses of berrylium and calcium is approx equals to atomic mass of magnesium.

Answer 2

Yes...

Since three of them have same outer shell configurations which results in similar chemical properties and the atomic mass of the middle element magnesium is roughly equal to the average atomic mass of Beryllium and calcium, they form a triad..

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