Discussion Overview
The discussion centers on the suitability of Mendeleev's periodic table for accommodating noble gases, focusing on the historical context of their discovery and classification. Participants explore how Mendeleev's methods of classification may have influenced the placement of elements, particularly noble gases, in the periodic table.
Discussion Character
- Historical
- Debate/contested
- Conceptual clarification
Main Points Raised
- Some participants note that noble gases were not included in Mendeleev's table because they had not been discovered at that time, with argon being added later in 1894.
- There is a suggestion that noble gases could be placed in the periodic table based on their atomic mass, which could be determined by weighing the gas, despite their lack of reactivity.
- One participant argues that Mendeleev utilized a wide range of information available during his time, including physical properties like melting and boiling points, to develop his periodic system.
- Another participant emphasizes that Mendeleev made significant contributions to chemistry, including rearranging elements based on properties that did not align with their assumed valence, which was not fully understood at the time.
- Some participants express a sentiment that Mendeleev's work laid the groundwork for future developments in the periodic table, such as those made by Moseley.
Areas of Agreement / Disagreement
Participants generally agree that noble gases were not part of Mendeleev's original table due to their undiscovered status. However, there is disagreement regarding the implications of Mendeleev's classification methods and the extent of his knowledge and contributions.
Contextual Notes
Limitations include the lack of clarity on how Mendeleev would have classified elements without knowledge of their reactivity and the assumptions made regarding atomic mass determination.