Classification of Elements and Periodicity in Properties
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Questions and Answers

What is the most important concept in chemistry, both in principle and in practice?

  • Electronic configuration
  • Atomic number
  • Periodic Law
  • The Periodic Table (correct)

    • What is the basis for the periodic classification of elements?

  • Ionic radii
  • Electronic configuration
  • Atomic number (correct)
  • Valence of elements

    • What do professionals find in the Periodic Table?

  • Everyday support for students
  • Main characteristics of elements
  • New avenues of research (correct)
  • Correlation between ionization enthalpy and metallic character

    • What is used to classify elements into s, p, d, f blocks and learn their main characteristics?

    <p>Electronic configuration</p> Signup and view all the answers

    Which IUPAC nomenclature is used to name the elements with Z > 100?

    <p>Periodic nomenclature</p> Signup and view all the answers

    Why do scientists need to classify elements?

    <p>To make it easier to study the chemistry of each element individually</p> Signup and view all the answers

    What was the contribution of Johann Dobereiner to the classification of elements?

    <p>He noted a similarity among the physical and chemical properties of several groups of three elements</p> Signup and view all the answers

    What did John Alexander Newlands observe about the arrangement of elements?

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

    Why is an awareness of the Periodic Table essential?

    <p>To disentangle the world and see how it is built up from the fundamental building blocks of chemistry</p> Signup and view all the answers

    What did Glenn T. Seaborg emphasize regarding the chemical elements?

    <p>They display trends and lie together in families</p> Signup and view all the answers

    What was the number of known elements in 1865?

    <p>63</p> Signup and view all the answers

    What did Johann Dobereiner note about the middle element of each Triad?

    <p>Its atomic weight was about half way between the atomic weights of the other two members</p> Signup and view all the answers

    Who was the first to consider the idea of trends among properties of elements?

    <p>Johann Dobereiner</p> Signup and view all the answers

    What did John Alexander Newlands arrange in increasing order and note similarities in properties?

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

    What did scientists search for to organize their knowledge about elements?

    <p>A systematic way to classify elements and rationalize known chemical facts about them</p> Signup and view all the answers

    What is the Periodic Table's significance in chemistry?

    <p>It serves as a daily reference for students and suggests new research directions for professionals</p> Signup and view all the answers

    What is the basis for the periodic classification of elements?

    <p>Atomic number and electronic configuration</p> Signup and view all the answers

    Which concept did Johann Dobereiner introduce in the classification of elements?

    <p>Triads, arranging elements based on similarities</p> Signup and view all the answers

    What is used to classify elements into s, p, d, f blocks and learn their main characteristics?

    <p>Atomic number and electronic configuration</p> Signup and view all the answers

    How did Newlands arrange elements and note similarities in properties?

    <p>By arranging elements in decreasing order of atomic mass</p> Signup and view all the answers

    What is the significance of ionization enthalpy in relation to metallic character?

    <p>Higher ionization enthalpy corresponds to lower metallic character</p> Signup and view all the answers

    What was the first attempt at classifying elements based on their properties?

    <p>Observation of trends among groups of three elements (Triads)</p> Signup and view all the answers

    What is the total number of known elements at present?

    <p>114</p> Signup and view all the answers

    Who was the chemist that noted a similarity among the physical and chemical properties of several groups of three elements (Triads)?

    <p>Johann Dobereiner</p> Signup and view all the answers

    What did John Alexander Newlands arrange in increasing order and observe similarities in properties?

    <p>Elements in the Law of Octaves</p> Signup and view all the answers

    Why was an awareness of the Periodic Table emphasized as essential?

    <p>To understand the fundamental building blocks of chemistry</p> Signup and view all the answers

    What is used to classify elements into s, p, d, f blocks and learn their main characteristics?

    <p>Electronic configuration of atoms</p> Signup and view all the answers

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