explain the limitations and achievements of doberenier newland and mendleev classification of elements
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explain the limitations and achievements of doberenier newland and mendleev classification of elements
explain the limitations and achievements of doberenier newland and mendleev classification of elements
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Limitations of mendeleev’s classification :
(i) He could not assign a correct position of hydrogen in his periodic table, as the properties of hydrogen resembles both with alkali metals as well as with halogens.
(ii) The isotopes of the same element will be given different position if atomic number is taken as basis, which will disturb the symmetry of the periodic table.
(iii) The atomic masses do not increases in a regular manner in going from one elements to the next.
Advantages of mendeleev's classification:
limitations of doberenier classifaction
Advantages doberenier
Newland Advantages
Limitations of Newland’s law of octaves:
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Answer:
Limitations of Newland’s law of octaves:
This law was applicable upto calcium only. After Ca every 8th element did not possess properties similar to that of the first.
It was assumed by Newland that only 56 elementsexist in nature and no more elements would be discovered in future. But later on several new elements were discovered whose properties did not fit into the law of octaves.
In order to fit elements Newlands adjusted two elements in the same slot but also put some unlike elements under the same note. Example cobalt and nickel.
Limitations of Mendeléev’s periodic table:
Position of hydrogen was uncertain as it behaves like alkali metals as well as like halogens.
No place for isotopes.
Atomic masses don't increase in regular manner from one element to next. Example : V and Cr.