Drawbacks 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. Similarly, it is asked, what are the merits and demerits of dobereiner's classification?
Demerits of dobereiner's triads system: It is limited to only few elements. - It does not completely explain the complete properties of elements like valency, oxidation state of elements which have variable oxidation state like phosphorus showing trivalent and pentavalent nature.
Beside above, what are the demerits of dobereiner triads? Drawback of Dobereiner's triads:
- Dobereiner could identify only three triads. He was not able to prepare triads of all the known elements.
- All the known elements could not be arranged in the form of triads.
- For very low mass or for very high mass elements, the law was not holding good. Take the example of F, Cl, Br.
Thereof, what are limitations of dobereiner classification?
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.
What were the limitations of dobereiner's classification Class 10?
Answer: 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.
Related Question Answers
What are the merits and demerits of Mendeleev periodic table?
✨Demerits of Mendeleev Periodic Table. He was unable to locate hydrogen in the periodic table. Increase in atomic mass was not regular while moving from one element to another. Hence, the number of elements yet to be discovered was not predictable. Why did dobereiner's law fail?
It was useless because not all elements could fit into this property. The law of triads was rejected because Doberiener failed to arrange all the known elements in form of triads. Besides,The law did not fully apply within the same family. What are the demerits of modern periodic table?
The positions of Hydrogen and Helium are not specifieke correct. The f-block elements are not include in the main table. Demerits of Modern Periodic Table: The Long form of periodic table is demerit free as it has all the qualities what should be in a classification table. What is periodicity?
Periodicity Definition. In the context of chemistry and the periodic table, periodicity refers to trends or recurring variations in element properties with increasing atomic number. Periodicity is caused by regular and predictable variations in element atomic structure. What were the demerits in Newlands periodic table?
After Calcium,every eighth element did not possess properties similar to that of the first. The elements that were discovered later could not be fitted into the law of octaves. After the discovery of Nobel gases,it became difficult to fit them in Newland's periodic table. What are the merits of modern periodic table?
The table is simple, systematic and easy way for remembering the properties of various elements as it is based on the electronic configuration. The important advantages of the modern periodic table are given below : This classification is based on the atomic number which is a more fundamental property of the elements. What is periodic law in chemistry?
the law that the properties of the elements are periodic functions of their atomic numbers. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights. What are the limitation of classification?
A disadvantage to classification is that many of the classifications themselves are based on subjective judgments, which may or may not be shared by everyone participating. This would lead to differences in perceived value. What were triads?
Triad, in chemistry, any of several sets of three chemically similar elements, the atomic weight of one of which is approximately equal to the mean of the atomic weights of the other two. The triad was the earliest atomic-weight classification of the elements. What is dobereiner's law of triads?
Dobereiner's law of triads states that, the atomic mass of the middle element of a triad is the arithmetic mean of the atomic masses of the other two elements. Example:In the triad of lithium, sodium and potassium. How did Newlands classify elements?
John Newlands put forward his law of octaves in 1864 in which he arranged all the elements known at the time into a table in order of relative atomic mass. When he did this, he found that each element was similar to the element eight places further on. What is a triad in chemistry?
Triad, in chemistry, any of several sets of three chemically similar elements, the atomic weight of one of which is approximately equal to the mean of the atomic weights of the other two. What are the qualities of Newlands law of octaves?
The law of octaves states that every eighth element has similar properties when the elements are arranged in the increasing order of their atomic masses. What was Newlands law of octaves?
Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements. What is modern periodic table?
The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table. And it consists of 18 vertical columns and 7 horizontal rows. Is Newland law of octaves applicable to all the three categories give reason to justify your answer?
No , Newland's law of octaves is not applicable to all the three categories . Category B and C are not following the Newland's law of octaves . " Every eighth element show similar properties when arranged in increasing atomic mass . " N , P and As show similar property but As is not eighth element from P . How did dobereiner classify the elements?
He proposed a law known as Dobereiner's law of triads. According to this law, when elements are arranged in the order of increasing atomic mass in a triad, the atomic mass of the middle element was found to be approximately equal to the arithmetic mean of the atomic masses of the other two elements. Do dobereiner triads features in Newlands table?
yes, dobereiner's triads also exist in the columns of newlands ' classification of elements based on the law of octaves. this means that according to newland's law of octaves,the elements lithium,sodium and potassium should have similar chemical properties. Why did Mendeleev leave some gaps in his periodic table?
Mendeleev left gaps in his periodic table because the properties of known elements predicted other, as-yet-undiscovered, elements in these locations. Mendeleev put together the periodic table on the basis of known properties about atoms, specifically the atomic mass, equivalent mass and valency. 
