Why Dobereiner, Newlands and Mendeleeff were not 100 % succesful in their classification of elements ? Why the modern table is relatively a better classification ? Predict reason.
Answers
Explanation:
Dobereiner, Newlands and Mendeleeff were not successful on there classification of elements because they have arranged the elements w.r.t. the atomic mass but not the atomic no....
The modern table is relatively a better classification because the classification is been made w.r.t their atomic number not the.atomic mass....
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Answer:
The Dobereiner's triads, newland's law of octaves and Mendeleev's periodic table had some of the other limitations because of which they were not hundred percent successful.
The most important reason due to which all the three were not successful was –The periodic function of elements was atomic masses where as the modern periodic table state the properties of elements as the periodic function of the atomic numbers.
Let us look at the advantages of modern periodic table which made it 100% successful:-
- It was easy to remember and reproduce.
- The prediction of properties of elements can be done on the basis of the position of an element in the periodic table.
- There was no need to assign separate positions for isotopes.
- The anomalous positions of some pairs of elements which were earlier misfited in the Mendeleev's periodic table had been justified. The example will be cobalt 27 and nickel 28.
- The uncertainty in production of new elements had been removed.