- Trending Categories
- Data Structure
- Operating System
- MS Excel
- C Programming
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
(a) State the merits of Mendeleev’s classification of elements.
(b) Describe two anomalies of Mendeleev’s periodic classification of elements.
(a) The merits of Mendeleev's classification of elements are given below:
- Mendeleev's periodic law predicted the existence of certain elements such as gallium, scandium, and germanium, which were not discovered at that time.
- It could also predict the properties of various elements based on their position in the periodic table.
- It could place group 18 elements, called Noble gases in the periodic table when they were discovered.
(b) Anomalies of Mendeleev's periodic classification of elements are given below:
- Mendeleev's periodic classification of elements could not explain the position of isotopes in the periodic table. Since isotopes of the same metal have similar chemical properties but differ in their atomic masses. So, the isotopes of the same element should be given a different place in the periodic table as Mendeleev's periodic table was arranged in increasing order of their atomic masses. However, isotopes were not given a separate place in his periodic table.
- Mendeleev's periodic classification of elements could not assign a proper place for the element, hydrogen. As hydrogen resembles both alkali metals and halogens in some of the properties.
Kickstart Your Career
Get certified by completing the courseGet Started