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Question

What were the criteria used by Mendeleev in creating his period. Why do you think the noble gases are placed in a separate group?

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Solution

Mendeleev used the relationship between the atomic masses and their physical and chemical properties and give the law that the properties of elements are the periodic functions of their atomic masses.

Noble gases are placed in separate groups because they are ultimately unreactive and do not combines with any other element in the periodic table.

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