what is the property of dobereiner's triads?
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Dobereiner's Triads
Dobereiner classified elements into groups of three (triad) where "The Atomic Weight of the middle element was the Average of the other two elements"
Example : Ca (Calcium) , Sr (Strontium) , Ba (Barium)
- Atomic weight of Ca = 40 a.m.u
- Atomic weight of Sr = 88 a.m.u
- Atomic weight of Ba = 137 a.m.u
Here Middle Element is Sr
⇒ 88 = (40 + 137)/2 ⇒ 88 = 177/2 ⇒ 88 = 88
Merits : The main achievement of this classification is that it recognized a relationship between properties of elements and their atomic weights
Drawbacks of this classification : The Drawbacks of this classification of this classification are as follows :-
- Some elements which are dissimilar were being grouped into a triad
- There are many elements that cannot be grouped into triads was proposed by Dobereiner
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