Pattern Of periodic table and limitations of :- 1.Doberiner 2.Newland 3.Mendeleeff
Answers
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.
DISADVANTAGES OF NEWLAND'S PERIODIC TABLE
1. He said that there only 56 elements in nature and no new elements would be found. but when new elements were found, he had no answer to that.
2. in order to fit all the elements in his table, he put two elements in the same slot which were not similar and was wrong.
3. it was also seen that newland's law of octaves was only applicable upto calcium. the rest did not match in their chemical properties.
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.
Later on, isotopes of elements were found which violated Mendeleev’s periodic law.
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