Ionic Radius Quiz
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Questions and Answers

What is the ionic radius?

  • The radius of an electron in an atom
  • The radius of a proton in a nucleus
  • The radius of a covalent bond in a molecular structure
  • The radius of a monatomic ion in an ionic crystal structure (correct)

    • How are ions treated in terms of their boundaries?

  • As having undefined boundaries
  • As hard spheres with radii (correct)
  • As irregularly shaped particles
  • As infinitely small points

    • What happens to the size of an ion when it loses an electron to form a cation?

  • The ion becomes neutral
  • The radius of the ion gets smaller (correct)
  • The radius of the ion remains unchanged
  • The radius of the ion gets larger

    • How do ionic radii behave on descending a group in the periodic table?

    <p>They increase</p> Signup and view all the answers

    What parameter can cause variation in ionic radius values?

    <p>Coordination number and spin state</p> Signup and view all the answers

    An ion in a high-spin state will be ______ than the same ion in a low-spin state

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

    Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values range from 31 pm (0.3 Å) to over 200 pm (2 Å). The concept can be extended to solvated ions in liquid solutions taking into consideration the ______ shell.

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

    When an atom loses an electron to form a cation, the other electrons are more attracted to the nucleus, and the radius of the ion gets ______.

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

    Ionic size (for the same ion) also increases with increasing ______ number

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

    Ionic radii increase on descending a ______.

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

    Explain the concept of ionic radius and how it is used in an ionic crystal structure.

    <p>Ionic radius is the radius of a monatomic ion in an ionic crystal structure. It is used to represent the distance between ions in a crystal lattice by considering the sum of ionic radii of the cation and anion as if they were hard spheres.</p> Signup and view all the answers

    What factors can cause variation in ionic radius values?

    <p>Ionic radius values can vary with coordination number, spin state, and other parameters.</p> Signup and view all the answers

    How do ionic radii behave on descending a group in the periodic table?

    <p>Ionic radii increase on descending a group.</p> Signup and view all the answers

    Explain how the size of an ion changes when it loses an electron to form a cation.

    <p>When an atom loses an electron to form a cation, the radius of the ion gets smaller as the other electrons are more attracted to the nucleus.</p> Signup and view all the answers

    In what units are ionic radii typically given, and what are the typical ranges for these values?

    <p>Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values range from 31 pm (0.3 Å) to over 200 pm (2 Å).</p> Signup and view all the answers

    Explain how the ionic radius of an ion can vary based on its electric charge and other parameters.

    <p>The ionic radius of an ion can vary based on its electric charge. When an atom loses an electron to form a cation, the other electrons are more attracted to the nucleus, causing the radius of the ion to decrease. Conversely, when an electron is added to an atom to form an anion, the added electron increases the size of the electron cloud by interelectronic repulsion, leading to an increase in the radius of the ion. Additionally, the ionic radius varies with coordination number, spin state, and other parameters.</p> Signup and view all the answers

    What are the typical units for expressing ionic radii and what are the typical ranges for these values?

    <p>Ionic radii are typically given in units of either picometers (pm) or angstroms (Å), with 1 Å = 100 pm. Typical values for ionic radii range from 31 pm (0.3 Å) to over 200 pm (2 Å).</p> Signup and view all the answers

    How do ionic radii behave in terms of periodic trends?

    <p>Similar to other types of atomic radius, ionic radii increase on descending a group in the periodic table.</p> Signup and view all the answers

    How does the size of an ion change with increasing coordination number?

    <p>Ionic size for the same ion increases with increasing coordination number.</p> Signup and view all the answers

    What factors can cause variation in ionic radius values?

    <p>The ionic radius values can vary based on coordination number, spin state, and other parameters.</p> Signup and view all the answers

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