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Can the following groups of elements be ...

Can the following groups of elements be classified as Dobereiner's Triads.
i] Na, Si, Cl `" "` ii] Be, Mg, Ca`
Atomic mass of `Be - 9. Na - 23, Mg -24, Si - 28, CI - 35, Ca - 40.` Justify your answer. 

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i] `Na-23, Si – 28, CI - 35`
Atomic mass of `Si = (23+35)/2 = 58/2 = 29`
ii] `Be-9, Mg -24, Ca = 40`
Atomic mass of Mg = `(40+9)/2 =49/2 = 24.5`
i) They cannot be classified as Dobereiner triads because they donot resemble with each other, though atomic mass of Si is the average of Na and CI. 
ii) It can be classified as Dobereiner.s triads because the elements resemble each other.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (SHORT ANSWER (SA) TYPE QUESTIONS)
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