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Which classification system arranged elements in the increasing order of their atomic masses?
Which classification system arranged elements in the increasing order of their atomic masses?
What is the name of the law that states that the properties of every eighth element, starting from a given element, are similar to that of the first element?
What is the name of the law that states that the properties of every eighth element, starting from a given element, are similar to that of the first element?
Which classification system classified elements into small groups called triads?
Which classification system classified elements into small groups called triads?
What is the atomic mass of the middle element in a triad according to Dobereiner's classification?
What is the atomic mass of the middle element in a triad according to Dobereiner's classification?
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Why was Dobereiner's classification rejected?
Why was Dobereiner's classification rejected?
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