Mendeleev relied on the similarities in the empirical formulas and pro...
Mendeleev placed the elements with similar properties together
View all questions of this test
Mendeleev relied on the similarities in the empirical formulas and pro...
Mendeleev's Classification of Elements
Mendeleev, a Russian chemist, is credited with the development of the periodic table of elements. His classification system was based on the empirical formulas and properties of the compounds formed by the elements. However, he encountered some difficulties when trying to organize the elements solely based on their atomic weights.
1. Similarities in Properties
Mendeleev observed that certain elements with similar properties did not fit into his scheme of classification if he strictly followed the order of atomic weight. This led him to consider the properties of the elements as a key factor in their arrangement.
2. Placing Elements with Similar Properties Together
In order to overcome this challenge, Mendeleev made the crucial decision to prioritize the similarities in properties over the order of atomic weight. He rearranged some elements to place those with similar properties together in the periodic table.
This decision allowed Mendeleev to identify patterns and trends in the properties of the elements. Elements with similar properties were grouped together in vertical columns called groups or families. This arrangement facilitated the understanding of the periodicity in the properties of elements and provided a framework for predicting the properties of undiscovered elements.
3. Amending the Periodic Law
By placing elements with similar properties together, Mendeleev effectively amended the periodic law. The periodic law states that the properties of elements are periodic functions of their atomic numbers. Mendeleev's classification system emphasized that the properties of elements are better understood when considering their similarities rather than strict adherence to atomic weight.
4. Placing Elements with Same Atomic Number Together
While Mendeleev's primary focus was on grouping elements with similar properties, he also recognized the importance of arranging elements in ascending order of atomic number. Ultimately, the modern periodic table is based on the atomic number, which represents the number of protons in an atom's nucleus.
This arrangement ensures that elements are placed in a logical order according to their atomic structure and enables a more comprehensive understanding of the periodic trends and relationships between elements.
In conclusion, Mendeleev's decision to prioritize the similarities in properties over atomic weight allowed him to create a more effective classification system. By placing elements with similar properties together, he established the foundation for the modern periodic table and provided a framework for understanding the periodicity of elements.
To make sure you are not studying endlessly, EduRev has designed Class 9 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 9.