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which of the following set of elements cannot be a triad?

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which of the following set of elements cannot be a triad?
A. `Li,Na,k`
B. B,Al,Ga
C. Be,Mg,Ca
D. Cl,Br,I
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Correct Answer - B
B,Al and Ga are not a triad beacuse the atomic weight of `Al` is not equal to avarage atomic weight of `B` and `Ga`.
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