Thank you!DrClaude said:The noble were not included in Mendeleev's table, as they had not been discovered (or isolated) at the time. It is only in 1894 after Ramsey discovered argon that it was added to the periodic table. I guess it was added at the right place because of its mass, which you get by simply weighing the gas.
I don't think this does justice to Mendeleev. There was hardly a chemist a his time with his knowledge and he used essentially all of the information of available at his time to set up his periodic system. This included also physical characteristics like melting and boiling points and he even re-arranged the position of some elements like Beryllium because it's other properties didn't fit to that deduced from it assumed valence, which was also not known with certainty at that time.Anithadhruvbud said:These noble gases do not react with hydrogen or oxygen.but Mendeleev basically classified by observing their reactions with hydrogen or oxygen.
But still mendeleev did something extraordinary.It was only after observing his table that Moseley was able to come up with his own.DrMendeleev 5387549 said:I don't think this does justice to Mendeleev. There was hardly a chemist a his time with his knowledge and he used essentially all of the information of available at his time to set up his periodic system. This included also physical characteristics like melting and boiling points and he even re-arranged the position of some elements like Beryllium because it's other properties didn't fit to that deduced from it assumed valence, which was also not known with certainty at that time.
Mendeleev's periodic table was designed to group elements with similar properties together. The noble gases, which have a full outer electron shell and therefore do not typically react with other elements, were placed in a separate group on the far right of the table. This placement allowed for easy identification and understanding of the properties of noble gases.
No, Mendeleev was not aware of the existence of noble gases when he created his periodic table. The noble gases were not discovered until later in the late 19th and early 20th centuries. However, his table was still able to accommodate them due to its flexible design and organization of elements based on their properties.
The inclusion of noble gases did not significantly affect the organization of Mendeleev's table. They were simply added as a new group on the far right, and their properties were consistent with their placement in the table based on their full outer electron shell.
One challenge in incorporating noble gases into Mendeleev's table was that their discovery and properties did not fit neatly into his original design. However, the flexibility of his table allowed for their inclusion without major changes to the overall structure.
Mendeleev's table was crucial in the understanding of noble gases as it allowed for their easy identification and comparison to other elements. By placing them in a separate group, it also highlighted their unique properties and helped in the development of the periodic law, which states that the properties of elements are periodic functions of their atomic numbers.