To construct the periodic table, Mendeleev did not only use the first 20 elements. He used a larger number of elements and their properties to develop his periodic table. Below is a detailed explanation of the process:
- Collection of Data:
Mendeleev collected data on various elements, including their atomic weights, properties, and chemical behaviors. He studied a wide range of elements beyond just the first 20.
- Pattern Recognition:
By analyzing the data, Mendeleev noticed patterns and similarities among the elements. He observed that certain properties repeated at regular intervals when the elements were arranged in order of increasing atomic weight.
- Development of Periodic Table:
Based on his observations, Mendeleev arranged the elements in a tabular format, placing elements with similar properties in the same columns. Gaps were left for undiscovered elements, and he even predicted the properties of these missing elements.
- Validation and Revision:
Mendeleev's periodic table was further validated and revised as new elements were discovered and more data became available. The periodic table we use today is an evolved version of Mendeleev's original table.
In conclusion, Mendeleev used a comprehensive dataset of elements, beyond just the first 20, to construct the periodic table. His innovative approach of recognizing patterns and organizing the elements laid the foundation for the modern periodic table.