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Questions and Answers
What did Johann Dobereiner discover about the elements in a triad?
What did Johann Dobereiner discover about the elements in a triad?
What did Henry Moseley use to determine the number of protons in the nucleus of an atom?
What did Henry Moseley use to determine the number of protons in the nucleus of an atom?
Who isolated potassium and sodium?
Who isolated potassium and sodium?
What did Robert Boyle state about an element?
What did Robert Boyle state about an element?
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Why did Dmitri Mendeleev leave gaps in his periodic table?
Why did Dmitri Mendeleev leave gaps in his periodic table?
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What did John Newlands discover about the eighth element?
What did John Newlands discover about the eighth element?
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Which scientist developed the concept of triads, where the atomic weight of the middle element is halfway between the other two elements?
Which scientist developed the concept of triads, where the atomic weight of the middle element is halfway between the other two elements?
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What was the basis of arrangement of elements in the periodic table developed by Henry Moseley?
What was the basis of arrangement of elements in the periodic table developed by Henry Moseley?
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What was the contribution of Humphry Davy to the development of the periodic table?
What was the contribution of Humphry Davy to the development of the periodic table?
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Which ancient civilization believed that there were only four elements?
Which ancient civilization believed that there were only four elements?
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