Which element trio forms a Dobereiner triad with atomic weights approximately 7, 23, and 39? - d and f BLOCK ELEMENTS Quiz | GKFix.in

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Question

Which element trio forms a Dobereiner triad with atomic weights approximately 7, 23, and 39?

A. F, Cl, Br
B. Li, Na, K
C. H, Li, Na
D. Be, Mg, Ca