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Can the following groups of elements be classified as Dobereiner's triad?

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asked Jan 18, 2018 in Chemistry by Kundan kumar (49,132 points) ● 34 ● 436 ● 1367
Can the following groups of elements be classified as Dobereiner's triad?
(a)Na, Si, Cl

(b) Be, Mg, Ca
Atomic mass of Be 9; Na 23; Mg 24; Si 28; Cl 35; Ca 40
Explain by giving reason.

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answered Jan 18, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 26
selected Jan 18, 2018 by Kundan kumar
 
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(a) No, because all these elements do not have similar properties although the atomic mass of silicon is average of atomic masses of sodium (Na) and chlorine (Cl).
(b) Yes, because they have similar properties and the mass of magnesium (Mg) is roughly the average of the atomic masses of Be and Ca.

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