What are limitations of doberiener's triads?

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Limitations of Dobereiner's classification: Dobereiner could find only three triads; .i.e total of 9 elements only. However the total number of elements were more than that of those encompassed in Dobereiner's Triad. Thus, Dobereiner's could not be classify most of the elements known at that time.

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Limitations of Dobereiner’s classification of elements was that it failed to arrange all the then known elements in the form of triads of elements having similar chemical properties. His classification was not applicable to all known elements but was limited only to a few elements. For example: nitrogen, Phosphorus and arsenic have similar chemical properties but they do not constituent a Dobereiner’s triad. Dobereiner’s could identify only three triads from the elements known at that time. So his classification of elements was not much successful. Dobereiner also failed to explain the relation between atomic masses of elements and their chemical properties.

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#1 He could not arrange the elements (in increasing atomic mass) that are not in the triads and also he could not arrange the then know elements in triads (i.e in increasing order of atomic masses)

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He could not arrange all the then known elements in triads

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Limitations of Dobereiner's Triads:

1. Limited applicability:
- Dobereiner's triads were limited in their applicability as they could only be applied to a small number of elements.
- The triads could only be formed by elements with similar chemical properties and atomic weights, which restricted their use to a specific group of elements.
- Moreover, not all elements could be classified into triads, making it difficult to generalize this concept to the entire periodic table.

2. Incomplete representation of elements:
- Dobereiner's triads only represented a small fraction of the known elements at the time.
- The triads were based on the assumption that only three elements with similar properties could be grouped together, which overlooked the existence of other elements that did not fit into these groups.
- This limited representation did not provide a comprehensive understanding of the periodicity of elements.

3. Lack of predictability:
- While Dobereiner's triads identified similarities between elements, they failed to predict the properties of unknown elements.
- The triads were formed based on the existing knowledge of elements, but they did not provide a framework for predicting the properties of undiscovered elements.
- This limited the practicality of Dobereiner's triads in terms of their ability to assist in the discovery or understanding of new elements.

4. Inaccurate atomic weight classification:
- Dobereiner's triads were based on the classification of elements according to their atomic weights.
- However, the atomic weight values used during Dobereiner's time were not always accurate, leading to discrepancies in the classification of elements into triads.
- The inaccuracies in atomic weight determination affected the reliability and consistency of the triads, making them less reliable for predicting element properties.

5. Lack of theoretical basis:
- Dobereiner's triads were based on empirical observations rather than a solid theoretical foundation.
- The concept of triads did not provide a clear explanation for the periodicity and trends observed in the properties of elements.
- This limited the scientific understanding and broader applicability of Dobereiner's triads.

Overall, while Dobereiner's triads played a significant role in the development of the periodic table, they had several limitations that restricted their usefulness and generalizability. The subsequent development of Mendeleev's periodic table addressed many of these limitations and provided a more comprehensive and predictive model for understanding the properties of elements.

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