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According to Dobernier law of triads, the three elements calcium, strontium, barium form a triad. Which of the following properties do these elements have to group them into a triad?I. Elements are in the increasing order of atomic weightII. Atomic weight of middle element is equal to average of atomic weight of extreme elementsIII. Elements in a triad have similar chemical proper es

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According to Dobernier law of triads, the three elements calcium, strontium, barium form a triad. Which of the following properties do these elements have to group them into a triad?<br>I. Elements are in the increasing order of atomic weight<br>II. Atomic weight of middle element is equal to average of atomic weight of extreme elements<br>III. Elements in a triad have similar chemical proper es






 
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