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1.What were the limitations of Dobereiner’s classification?
2. Why do you think the noble gases are placed in a separate group?
Answer variants:
Mendeleev used the relationship between the atomic number of the elements and their physical and chemical properties.
Noble gases are chemically inert and are present in the atmosphere in extremely low concentrations.
It failed to arrange all the then-known elements in triads of elements with similar chemical properties.
Yes, Dobereiner’s triads also existed in the cells of Newland’s Octaves.
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