Why were Dobereiner, Newlands and Mendeleeff not 100% successful in th

1.	Why were Dobereiner, Newlands and Mendeleeff not 100% successful in their classification of elements? Why is the modern table relatively a better classification? Predict the reason.
Answer» 1. All the known elements at the time of Dobereiner could not be arranged in the form of triads. 2. Newlands’ periodic table was restricted only for 56 elements. 3. As Mendeleeffs classification is based on atomic weight, his classification led to two defects like anomalous pair of elements and dissimilar elements placed together. 4. Modern periodic table was prepared on the basis of atomic number. So the periods and groups are clearly defined. 5. Hence Dobereiner, Newlands, and Mendeleeffs classifications were not 100% successful, but modern classification is successful.

Why were Dobereiner, Newlands and Mendeleeff not 100% successful in their classification of elements? Why is the modern table relatively a better classification? Predict the reason.

Answer»

1. All the known elements at the time of Dobereiner could not be arranged in the form of triads.

2. Newlands’ periodic table was restricted only for 56 elements.

3. As Mendeleeffs classification is based on atomic weight, his classification led to two defects like anomalous pair of elements and dissimilar elements placed together.

4. Modern periodic table was prepared on the basis of atomic number. So the periods and groups are clearly defined.

5. Hence Dobereiner, Newlands, and Mendeleeffs classifications were not 100% successful, but modern classification is successful.

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