Chapter 5: Periodic Classifications of Elements

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Periodic Classifications of Elements


Why do you think the noble gases are placed in a separate group?


When noble gases such as helium, neon, and argon were discovered, Mendeleev created the ‘ zero’ group without disturbing the original periodic table in which the noble gases were fitted very well. This is because the nobles gases are highly unreactive and do not form compounds by reacting with other elements.

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