Dobereiner Triad Rule Quiz
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Questions and Answers

According to the Dobereiner triad rule, how many elements are grouped together?

  • Four
  • Three (correct)
  • Two
  • Five

    • In a Dobereiner triad, what is the relationship between the atomic weight of the middle element and the average atomic weight of the first and third element?

  • The atomic weight of the middle element is equal to the average atomic weight of the first and third element. (correct)
  • The atomic weight of the middle element is greater than the average atomic weight of the first and third element.
  • The atomic weight of the middle element is unrelated to the average atomic weight of the first and third element.
  • The atomic weight of the middle element is less than the average atomic weight of the first and third element.

    • Which of the following sets of elements is an example of a Dobereiner triad?

  • (Li, Be, B) (correct)
  • (Na, Mg, Al)
  • (O, S, Se)
  • (Ca, Sr, Ba)

    • Which element's properties are similar to the properties of the 8th element in the Newland Octave Rule?

    <p>Na</p> Signup and view all the answers

    According to the Newland Octave Rule, how did Newland arrange the elements?

    <p>In the increasing order of their atomic mass</p> Signup and view all the answers

    Which type of elements were not known at the time of the Newland Octave Rule?

    <p>Noble gases</p> Signup and view all the answers

    According to the Dobereiner triad rule, how many elements are grouped together?

    <p>3 elements</p> Signup and view all the answers

    According to the Newland Octave Rule, how did Newland arrange the elements?

    <p>In order of increasing atomic number</p> Signup and view all the answers

    Which of the following sets of elements is an example of a Dobereiner triad?

    <p>Carbon, Silicon, Germanium</p> Signup and view all the answers

    Which of the following is a drawback or limitation of the Newland Octave Rule?

    <p>The rule fails in the case of heavier metals like Fe.</p> Signup and view all the answers

    Why is the Newland Octave Rule no longer applicable after the discovery of inert gases?

    <p>Inert gases do not follow the pattern of the Newland Octave Rule.</p> Signup and view all the answers

    Why does the Newland Octave Rule fail in the case of heavier metals like Fe?

    <p>Heavier metals have more than 8 elements in their period.</p> Signup and view all the answers

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