Can the tolto\ving groups or clcrncnts be clas&ificd as Dobereincr's triad. (a) Na, Si, Cf (h) Be, Mg, Ca Ato,nic 1nass of Bc--9~ Na-23, Mg-24, Sj--28, Cl--35, Ca-40. Justify your answer in each case.
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