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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:
Noble gases are chemically inert and are not present in the atmosphere in extremely high concentrations.
It failed to arrange all the then-known elements in triads of elements with similar chemical properties.
It failed to arrange all the then-known elements in triads of elements with similar physical properties.
Noble gases are chemically inert and are present in the atmosphere in extremely low concentrations.
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