Question

the modern periodic table has been evolved through the early attempt of dobereiner,newland.and mendeleev. list one advantage and one limitation of three attempt

Answer 1

Many attempt have been made before the origination of the Modern Periodic Table. 
First attempt was the Dobereinier law of triads. 

Advantages of the Dobereinier law of the triads are ⇒

1) It was the First attempt to arrange the elements in a sequential manners.
2) It had made the Research at that time easy and comparative.    
3) It correlated the atomic masses of the elements. 

Limitations of the Dobereinier law of the Triads are ⇒

1) It was not applicable for all the Elements. 
2) Scientists at that time was not able to correlate all the Elements of that time. 

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Advantages of the Newlands law of Octaves are ⇒

1) It made the study of the elements easy and comparative.
2) It provided the base for the Research in the Field of the Chemistry of that time. 

Limitations of the Newlands law of the Octaves are ⇒

1) It was only applicable for those elements which was discovered at that time. After the discovery of the Noble gases, this Methods was failed. 

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Advantages of the Mendeleev Periodic tables are ⇒

1) He arranged the elements in the tabular forms which was very much easy to understand and provided the lot of scope in the Filed of the Chemistry.
2) He even predicted the Properties of the Elements which was not discovered at that time.
3) All the Elements which have the same properties are arranged in the Particular Groups.   


Limitations of the Mendeleev periodic tables are ⇒

1) Hydrogen was not designated the Proper position in Mendeleev periodic table. 
2) The Positions of the Isotopes are also not clarified in the table.



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Answer 2

1) advantages:-it was the first time to arrange the elements in a sequential manners

limitation:-it was not applicable for all the elements

2) advantages:-it made the study of elements easy and comparative

limitation:-it was not applicable for those elements which was discovered at that time. after the discovery of the noble gases,this method was failed

3) advantages:-all the elements which have same properties are arranged in the particular group

limitation:-position of hydrogen was not designated




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