differences between dobereiner traid, Newlands law of octaves and mandleev periodic table and modern periodic table .for full answer i marked your answer as brainliest
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QUESTION : differences between dobereiner traid, Newlands law of octaves and mandleev periodic table and modern periodic table .for full answer i marked your answer as brainliest
ANSWER : Newlands Law of Octaves has many limitations, which are discussed below.
This law was not applicable throughout the arrangement. It was applicable only till calcium.
Newlands assumed that only 56 elements would exist in nature and believed that no more elements would be discovered. However, several elements were discovered in the following years. These elements did not follow the Law of Octaves.
The positions of cobalt and nickel could not be explained according to Newlands Law of Octaves. He kept cobalt and nickel in the same slot. They were also placed in the same column as fluorine and chlorine, which have completely different properties.
The properties of iron are similar to those of cobalt and nickel. However, iron was placed away from them in a different column.
Merits of Newlands Law of Octaves____
Newlands law of octave provided a basis for the classification of element on the basis of having similar properties into groups of elements.
The arrangement of elements in tabular form was provided by Newlands law of Octaves.
Newlands law of octave was the first logically basis on the atomic weight.
Demerits of dobereiner’s triads system:
- This system fails because it does not hold good for all the elements discovered till date time. It is limited to only few elements.
- It does not completely explain the complete properties of elements like valency, oxidation state of elements which have variable oxidation state like phosphorus showing trivalent and pentavalent nature.
- It does not fit to transition elements.
The only advantage of Dobereiner’s research was that it made chemists look at elements in terms of groups of elements with similar chemical and physical properties. This eventually led to rigorous classification of elements and the modern periodic table of elements, as we now know it, was discovered.
Mendeleev's :
MERITS ARE
1. The classification of elements is based on the atomic number, which is a more fundamental property.
2. The reason for placing isotopes at one place is justified as the classification is on the basis of atomic number.
3. It explains the periodicity of the properties of the elements and relates them to their electronic configurations.
5. The position of the elements that were misfits on the basis of mass number (anomalous pairs like argon and potassium) could be justified on the basis of atomic number.
6. The lanthanides and actinides are placed separately at the bottom of the
periodic table.
7. The table is simple, systematic and easy way for remembering the properties of various elements as it is based on the electronic configuration.
Modern periodic table :
Modern periodic table has many benefits as it classifies the elements on the basis of electronic configuration of elements.
By arranging the elements in this way it is easy to remember the elements in sequence. The elements are distributed in different blocks to make the study easier.
The elements present in the same group show similar physical and chemical properties as they have same valence electron in their last shell.
Correct position to inert gases is given in Modern periodic table.
It is easier to understand the properties of the elements as they are grouped into different blocks i.e. s, p, d and f.
Accurate position to every element is provided in Modern periodic table.
Metals, Non-metals and metalloids are grouped differently to make the study easier
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QUESTION : differences between dobereiner traid, Newlands law of octaves and mandleev periodic table and modern periodic table .for full answer i marked your answer as brainliest
ANSWER : Newlands Law of Octaves has many limitations, which are discussed below.
This law was not applicable throughout the arrangement. It was applicable only till calcium.
Newlands assumed that only 56 elements would exist in nature and believed that no more elements would be discovered. However, several elements were discovered in the following years. These elements did not follow the Law of Octaves.
The positions of cobalt and nickel could not be explained according to Newlands Law of Octaves. He kept cobalt and nickel in the same slot. They were also placed in the same column as fluorine and chlorine, which have completely different properties.
The properties of iron are similar to those of cobalt and nickel. However, iron was placed away from them in a different column.
Merits of Newlands Law of Octaves____
Newlands law of octave provided a basis for the classification of element on the basis of having similar properties into groups of elements.
The arrangement of elements in tabular form was provided by Newlands law of Octaves.
Newlands law of octave was the first logically basis on the atomic weight.
Demerits of dobereiner’s triads system:
- This system fails because it does not hold good for all the elements discovered till date time. It is limited to only few elements.
- It does not completely explain the complete properties of elements like valency, oxidation state of elements which have variable oxidation state like phosphorus showing trivalent and pentavalent nature.
- It does not fit to transition elements.
The only advantage of Dobereiner’s research was that it made chemists look at elements in terms of groups of elements with similar chemical and physical properties. This eventually led to rigorous classification of elements and the modern periodic table of elements, as we now know it, was discovered.
Mendeleev's :
MERITS ARE
1. The classification of elements is based on the atomic number, which is a more fundamental property.
2. The reason for placing isotopes at one place is justified as the classification is on the basis of atomic number.
3. It explains the periodicity of the properties of the elements and relates them to their electronic configurations.
5. The position of the elements that were misfits on the basis of mass number (anomalous pairs like argon and potassium) could be justified on the basis of atomic number.
6. The lanthanides and actinides are placed separately at the bottom of the
periodic table.
7. The table is simple, systematic and easy way for remembering the properties of various elements as it is based on the electronic configuration.
Modern periodic table :
Modern periodic table has many benefits as it classifies the elements on the basis of electronic configuration of elements.
By arranging the elements in this way it is easy to remember the elements in sequence. The elements are distributed in different blocks to make the study easier.
The elements present in the same group show similar physical and chemical properties as they have same valence electron in their last shell.
Correct position to inert gases is given in Modern periodic table.
It is easier to understand the properties of the elements as they are grouped into different blocks i.e. s, p, d and f.
Accurate position to every element is provided in Modern periodic table.
Metals, Non-metals and metalloids are grouped differently to make the study easier
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devanshri:
thnx for the answer
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