Chemistry: Dobereiner's Law of Triads and Newlands' Law of Octaves
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Chemistry: Dobereiner's Law of Triads and Newlands' Law of Octaves

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Questions and Answers

Which chemist proposed the law of triads grouping elements in threes based on their similar properties?

  • Dmitri Mendeleev
  • J.W. Dobereiner (correct)
  • J.A. Newlands
  • Henry Moseley

    • In Dobereiner's law of triads, the atomic mass of the middle element was approximately equal to:

  • The sum of the other two elements' atomic masses
  • The arithmetic mean of the other two elements' atomic masses (correct)
  • Half of the atomic mass of the heaviest element
  • Twice the atomic mass of the lightest element

    • What is the basis of classification in Newlands' Law of Octaves?

  • Valency
  • Atomic mass (correct)
  • Electronegativity
  • Atomic number

    • How did J.A. Newlands relate his Law of Octaves to musical notes?

    <p>Every eighth element has properties similar to the first element</p> Signup and view all the answers

    The Law of Octaves is named as such because it involves a repetition pattern after how many elements?

    <p>8 elements</p> Signup and view all the answers

    What was a major drawback of Newlands' law of Octaves?

    <p>It failed to classify elements with atomic masses greater than 40 u.</p> Signup and view all the answers

    Why was the ninth element crucial for the rejection of the idea of octaves?

    <p>It exhibited properties similar to the first element.</p> Signup and view all the answers

    What was the fundamental property used by Newlands for classifying elements?

    <p>Atomic mass</p> Signup and view all the answers

    What distinguished Meyer and Mendeleev's work from Newlands' law of Octaves?

    <p>They included almost all known elements in their classification.</p> Signup and view all the answers

    Why was Mendeleev's classification more widely accepted than Newlands' law of Octaves?

    <p>Mendeleev's classification included a broader range of elements.</p> Signup and view all the answers

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