(b) 
Atomic mass
of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40
Explain by
giving reason.
Answer:
(a) Na, Si and
Cl have different properties, therefore, they do not form a Dobereiner's triad even
though the atomic mass of the middle atom (Si) is approximately the average of the
atomic masses of Na and Cl i.e.,
Atomic mass
of
(b) Be, Mg
and Ca have many similar properties and also the atomic mass of the middle element
Mg is approximately the average of the atomic masses of Be and Ca i.e.,
Atomic mass
of 
Therefore,
they form a Dobereiner's triad.
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