Electronegativity in Chemistry
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Questions and Answers

Why does electronegativity decrease down a group on the periodic table?

  • The radioactive nature of elements in period 7.
  • The gain of electrons that occupy energy shells closer to the nucleus.
  • The full outer shells of noble gases.
  • The presence of more electron shells between the nucleus and the outermost electrons. (correct)

    • How does the number of electron shells affect nuclear shielding?

  • More electron shells increase shielding. (correct)
  • More electron shells result in decreased shielding.
  • Fewer electron shells increase shielding.
  • Fewer electron shells have no effect on shielding.

    • Why do noble gases have electronegativity values of 0.0?

  • Because they are in period 7 of the periodic table.
  • Due to the presence of radioactive isotopes.
  • Because they have full outer shells of electrons. (correct)
  • Because they have a high number of valence electrons.

    • In what scenario are nonpolar molecules formed?

    <p>When carbon bonds with hydrogen.</p> Signup and view all the answers

    How is the polarity of the amide group utilized in drug manufacturing?

    <p>To make drugs soluble and more effective.</p> Signup and view all the answers

    Why do elements with atomic numbers greater than 104 have electronegativity values of 0.0?

    <p>Because their nucleus is unstable and breaks down.</p> Signup and view all the answers

    What effect does having more electron shells between the nucleus and outermost electrons have on electronegativity?

    <p>It decreases electronegativity.</p> Signup and view all the answers

    Why do Francium's outermost electrons get easily pulled away from its nucleus?

    <p>Due to the low number of electron shells between the nucleus and outermost electrons.</p> Signup and view all the answers

    What is the reason behind nonpolar and polar substances not mixing well?

    <p>Their different polarities make them repel each other.</p> Signup and view all the answers

    What factor contributes to the low or nonexistent level of nuclear shielding in an atom?

    <p>The presence of more electron shells between the nucleus and the outer shell electrons</p> Signup and view all the answers

    Which element is likely to have the lowest electronegativity value?

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

    Why do noble gases typically have an electronegativity value of 0.0?

    <p>Their atoms have full outer electron shells</p> Signup and view all the answers

    What characteristic makes molecules with a C-H bond nonpolar?

    <p>Similar electronegativities of carbon and hydrogen</p> Signup and view all the answers

    What effect does moving down a group on the periodic table have on the electronegativity of elements?

    <p>Decreases electronegativity</p> Signup and view all the answers

    Which atoms bond together to form an amide bond that joins amino acids in proteins?

    <p>Carbon and nitrogen</p> Signup and view all the answers

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