Oxidation States of First Transition Series
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Questions and Answers

Which element shows six different oxidation states due to its 5 unpaired d electrons?

  • Vanadium
  • Manganese (correct)
  • Scandium
  • Titanium

    • What happens when transition elements lose one 4s electron?

  • Formation of M ion (correct)
  • Formation of M^{4+} ion
  • Formation of M² ion
  • Formation of M^{3^{+}} ion

    • What trend is observed in the atomic radii of the elements of the transition series from left to right?

  • Decrease gradually (correct)
  • Increase gradually
  • Remain constant
  • Fluctuate irregularly

    • What happens as the number of unpaired electrons in 3d orbitals increases?

    <p>The number of oxidation states shown by the element also increases</p> Signup and view all the answers

    Why do d electrons offer smaller screening effect compared to other electrons?

    <p>$n-1$d subshell is less penetrating or more diffused</p> Signup and view all the answers

    What happens to the oxidation states of transition elements as the number of unpaired electrons in 3d orbitals increases?

    <p>The number of oxidation states shown by the element also increases</p> Signup and view all the answers

    What happens to the atomic radii of transition elements as we move across a transition series from left to right?

    <p>The atomic radii decrease gradually</p> Signup and view all the answers

    Which element in the first transition series shows oxidation states from -2 to +7?

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

    What happens when a transition element loses two 4s electrons?

    <p>$M^{2+}$ ion is formed</p> Signup and view all the answers

    Why do d electrons offer smaller screening effect compared to other electrons?

    <p>D orbitals in an atom are less penetrating or more diffused</p> Signup and view all the answers

    Match the following oxidation states with their corresponding electron loss:

    <p>Loss of one 4s electron = M² ion Loss of two 4s electrons = M^{3^{+}} ion Loss of unpaired 3d and 4s electrons = M ion</p> Signup and view all the answers

    Match the following elements with the number of oxidation states they show:

    <p>Scandium = Only one unpaired electron Manganese = -2 to +7 oxidation states</p> Signup and view all the answers

    Match the following trends with the atomic radii of d block elements:

    <p>Atomic radii decrease gradually from left to right = Trend in atomic radii Nuclear charge increases from left to right = Trend in atomic radii D orbitals offer smaller screening effect = Trend in atomic radii D electrons enter a penultimate (n-1)d subshell = Trend in atomic radii</p> Signup and view all the answers

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