What were the limitations of Dobereiner's classification?

 Limitations of Dobereiner’s classification of elementsare as follows:

 
  • All known elements could not be classified into groups of triads on the basis of their properties
  • Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.
 
Nitrogen family
Element
Atomic mass
Nitrogen
14
Phosphorus
31
Arsenic
74.9
 
Average mass of nitrogen and arsenic = 
 = 44.45
 
In this case, the mass of phosphorus is not equal to the average mass of the other two elements i.e., nitrogen and arsenic. Hence, the elements of this group do not obey Dobereiner’s Law of Triads.
 
Hope it is clear to you.
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Dobereiner could find only three triads from the elements discovered at that time.

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Thanks bluestar and Ash!!

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Doberenier could find only three traids [groups] from the elements known at that time , since this system was not found to be usefull.  

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Two important limitations are:   All known elements could not be classified into groups of triads on the basis of their properties .   Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.
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He could not place all the then know elements in trade. Hence, the classification was not found to be very accurate and useful
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he could find only three elements from the triads
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Two important limitations are:   All known elements could not be classified into groups of triads on the basis of their properties .   Not all groups obeyed the Law of Triads. For example, nitrogen family does not obey the Law of Triads.
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the traids were only till 3 traids
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I have not better answer
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He couldy only identify 3 triads at that time
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Doberenier could identify only three traids . He was not able to prepare traids of all the known elements at that time .
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Don't know
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He could only identify three traits at that time
1.Li Na K
2.Ca Sr Ba
3.Cl Br I
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He could only classify three triads from the elements discovered at that time. Many chemically similar elements like nitrogen, phosphorus and arsenic couldn't prove the validity of dobereiner theory of triads. Many elements having different chemical properties like carbon, nitrogen and oxygen couldn't verify his theory of triads. Hope this answer help you
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Dobreiner's limitation
 
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Please find this answer

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The answer is the answer give above or below. And ree kids hate you too
 
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