Classification of Elements in the 19th Century
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Questions and Answers

What was the purpose of classifying elements in the 19th century?

  • To complicate the field of chemistry.
  • To make the study of individual elements easier. (correct)
  • To keep the atomic masses a secret.
  • To confuse scientists with unnecessary classifications.

    • What did Dobereiner attempt to do with his 'Triads' classification?

  • Classify elements based on their size.
  • Classify elements with similar properties into groups of three. (correct)
  • Classify elements into two big groups.
  • Classify elements based on their color.

    • According to Dobereiner, what was unique about the atomic mass of the element in the middle of a triad?

  • It was always lower than the mean of the other two atomic masses.
  • It was always equal to the mean of the other two atomic masses. (correct)
  • It had no specific relationship to the other two atomic masses.
  • It was always higher than the other two elements.

    • How many triads were mentioned by Dobereiner in his classification system?

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

    What was one of the limitations of Dobereiner's Triads classification?

    <p>Could not classify all known elements at that time.</p> Signup and view all the answers

    Why was it important to classify elements into groups during the 19th century?

    <p>To simplify the study of various elements.</p> Signup and view all the answers

    Which statement best describes Dobereiner's approach to classification?

    <p>Organizing elements into groups with similar properties.</p> Signup and view all the answers

    'Triads' in Dobereiner's classification system consisted of how many elements?

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

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