Which fact is not valid for Dobereiner's triads? (a) The atomic weight of middle element is roug...

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Which fact is not valid for Dobereiner's triads?
(a) The atomic weight of middle element is roughly average of the other two elements
(b) The properties of middle element is roughly average of the other two elements
(c) The elements of triads belong to the same group of modern periodic table
(d) The elements of triads have same valency electrons.
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