Question

Can the following groups of elements be classified as Dobereiner's
triad:
(a) Na, Si, CI
(b) Be, Mg, Ca
Atomic mass of Be-9; Na-23, Mg-24, Si-28, CH-35. Ca-40.
Justify your answer in each case.
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Answer 1

(a) No, b'coz it's observed that the atomic mass of Si is not equal to the average of both the mass of Na & Cl .

(b) Yeah, b'coz it's observed that the atomic mass of My is equal to the average of both the mass of both Be & Ca approximately .