Classification of Elements by Early Chemists
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Questions and Answers

How did Dobereiner arrange elements in his triads?

  • In order of valency
  • In increasing order of atomic weights (correct)
  • In order of metallic character
  • In order of atomic numbers

    • What was the flaw found in Newland's method of arranging elements?

  • Repetition of elements (correct)
  • Inconsistent atomic weights
  • Failure to account for undiscovered elements
  • Lack of periodicity

    • What did Mendeleeff's Periodic Table fail to justify the position of?

  • Elements with variable valency
  • Rare earth elements (correct)
  • Elements with non-metallic character
  • Isotopes

    • What was Moseley's key improvement over Mendeleeff's Periodic Table?

    <p>Classification based on atomic numbers</p> Signup and view all the answers

    In Dobereiner's triads, what was the relationship between the atomic weight of the middle element and the other two?

    <p>Equal to the average</p> Signup and view all the answers

    What was the critical flaw of Newland's arrangement method regarding undiscovered elements?

    <p>No space left for hypothetical elements</p> Signup and view all the answers

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