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Mendeleev's periodic law, Advantages and Disadvantages of Mendeleev's periodic table. - Class 10 PDF Download
Mendeleev's periodic law:-
Mendeleev's periodic law states that, " The properties of elements are the periodic functions of their atomic mass ".
Note:- 63 elements are known during his period.
° He tried to arrange the elements on the basis of their reaction with hydrogen and oxygen because, they are most reactive elements, react with most of other element.
What were the criteria used by Mendeleev in creating periodic table? So, let us see what are those criteria.
[•] Increasing order of Atomic mass.
[•] Similarity in reaction of elements with
hydrogen and oxygen.
Mendeleev arranged elements in the horizontal rows called periods and vertical columns called groups. There are 8 groups and 6 periods in his periodic table.
Advantages or achievements of Mendeleev's periodic table:-
[•] Elements were grouped on more fundamental basis.
[•] Because of their placement in the periodic table, properties of several elements yet to be discovered like Scandium, Gallium and Germanium could be predicted.
Example:-
Scandium was predicted as Eka Boron .
Gallium was predicted as Eka Aluminium .
Germanium was predicted as Eka Silicon .
[•] Gaps for 40 new elements were kept.
[•] The discovery of new elements, inert gases did not disturbed the arrangement and they found their place as a new group.
Disadvantages of Mendeleev's periodic table:-
[•] He placed an element with slightly greater atomic mass before the element with lower atomic mass.
Example:-
Fe - 55.85 , Co - 58.93 ,
Ni - 58.71.
[•] No fixed position could be given to hydrogen in periodic table (Placed in both 1st and 7th group . It's properties resemble with both Alkali metals and Halogens. Because, it can loose one electron (e–) like Alkali and gain 1e– like Halogens).
[•] Isotopes of various elements cannot be filled into Mendeleev's table ( Isotopes are the elements having similar chemical properties but different atomic mass ).
[•] Chemically, dissimilar elements are placed together in same group with Alkali metals.
(Example:- Cu, Ag, Au ).
[•] Mercury, Lead and Barium ( Hg, Pb, Ba ) which posses similar properties fall into different group.
FAQs on Mendeleev's periodic law, Advantages and Disadvantages of Mendeleev's periodic table. - Class 10
| 1. What is Mendeleev's periodic law? |  |
Ans. Mendeleev's periodic law states that when elements are arranged in order of increasing atomic mass, their properties repeat periodically. This means that elements with similar properties occur at regular intervals in the periodic table.
| 2. What are the advantages of Mendeleev's periodic table? | |
Ans. The advantages of Mendeleev's periodic table include:
- It provided a systematic arrangement of elements based on their properties, allowing for easy classification and identification.
- It predicted the existence of unknown elements and their properties, which were later discovered and found to fit into the periodic table.
- It allowed for the identification of trends and patterns in element properties, leading to a better understanding of chemical behavior.
- It facilitated the prediction of the properties of elements based on their position in the table.
- It provided a foundation for further research and development in the field of chemistry.
| 3. What are the disadvantages of Mendeleev's periodic table? | |
Ans. The disadvantages of Mendeleev's periodic table include:
- It did not accurately place all elements in their correct positions based on atomic mass. Some elements had to be placed in different groups to maintain similar properties.
- It did not account for the concept of atomic number, which was later discovered to be a more accurate way of arranging elements.
- It did not explain the reason behind the periodicity of element properties, only observed the pattern.
- It did not provide a clear explanation for the variations in chemical properties within certain groups of elements.
- It did not incorporate the concept of isotopes, which are atoms of the same element with different numbers of neutrons.
| 4. How did Mendeleev's periodic table contribute to the understanding of elements? | |
Ans. Mendeleev's periodic table contributed to the understanding of elements in several ways:
- It provided a systematic arrangement of elements based on their properties, allowing for easy classification and identification.
- It predicted the existence of unknown elements and their properties, which were later discovered and found to fit into the periodic table.
- It allowed for the identification of trends and patterns in element properties, leading to a better understanding of chemical behavior.
- It facilitated the prediction of the properties of elements based on their position in the table.
- It provided a foundation for further research and development in the field of chemistry.
| 5. How is Mendeleev's periodic table relevant in modern chemistry? | |
Ans. Mendeleev's periodic table is still relevant in modern chemistry because it laid the foundation for the organization and understanding of elements. Although his table has been modified and improved over time, the basic principles and concepts introduced by Mendeleev are still used today. The periodic table is a fundamental tool in chemistry, allowing scientists to predict element properties, understand trends and patterns, and classify elements based on their similarities and differences. It continues to be a vital reference for chemical research and education.
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