In Mendeleev's periodic table, why was there no mention of noble gases like Helium, Neon and argon?

Question

Answer

In Mendeelev's periodic table there was no mention of noble gases like helium, neon, and argon as they were not known at that time and were discovered much later. Since they are very inert gases, it was difficult to detect them with the primitive technology.

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Noble gases were not discovered that time

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These noble gases were discovered long after mendeleev's periodic table

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Explanation: Why there was no mention of noble gases in Mendeleev's periodic table?

Mendeleev's periodic table was published in 1869, which was based on the increasing atomic mass and chemical properties of the elements. However, at that time, noble gases, such as helium, neon, and argon, were not known to exist. Therefore, they were not included in his periodic table.

Discovery of Noble Gases

The discovery of noble gases occurred after the publication of Mendeleev's periodic table. Helium was first discovered in 1868 by French astronomer Jules Janssen and British astronomer Joseph Norman Lockyer. Neon, argon, krypton, and xenon were discovered later in the 1890s by Sir William Ramsay and Lord Rayleigh.

Properties of Noble Gases

Noble gases have unique properties compared to other elements. They have a completely filled outermost electron shell, making them very stable and unreactive. This property was not understood until the discovery of the electronic configuration of atoms. Mendeleev's periodic table could not explain the stability and unreactivity of noble gases because it was based on chemical properties only.

Adding Noble Gases to the Periodic Table

Once the existence and properties of noble gases were discovered, they were added to the periodic table as a separate group. This group, also known as Group 18 or the noble gas group, consists of helium, neon, argon, krypton, xenon, and radon. They are located in the far-right column of the periodic table because of their unique electronic configuration and unreactivity.

Conclusion

In conclusion, Mendeleev's periodic table did not include noble gases because they were not known to exist at the time. However, after their discovery and understanding of their properties, they were added to the periodic table as a separate group. This group is now an essential part of the periodic table and has unique properties that distinguish them from other elements.

Answer

In Mendeleev periodic table noble gases such as Helium, neon and Argon are not mentioned because they are not known at that time.

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In Mendeleev periodic table noble gases are not mentioned because they are not known that time they are discovered much later but when they are discovered the get opposition in Mendeleev periodic table without disturbing The Other elements periodic table.

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In Mendeleev periodic table the noble gas like Helium neon and Argon are not mentioned  because they are not know at that time

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