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  • 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.

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.

Answers (1)

Doberenier’s Triads: It is the arrangement of elements as a set containing 3 elements where mass of middle element is equal or close to the average of other two elements.
(a)(23) ; Si(28) ; Cl(35)
Atomic Mass of Si= \frac{23+35}{2}= \frac{58}{2}
                            = 29

Silicon mass is close to the average of Sodium and chlorine but the above three elements are not dobereiner’s traits as the properties of the elements don’t match.
(b)Be(9) ; Mg(24) ; Ca(40)
Atomic mass of Mg= \frac{9+40}{2}= 24\cdot 5
Magnesium mass is close to the average of Beryllium and calcium and all the three
elements have common properties therefore the above three elements are a dobereiner’s triads.
 

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