Trends in the Periodic Table MCQ1
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Questions and Answers

What is the atomic radius of an element defined as?

  • The distance between the nuclei of two atoms of the element joined together by a double covalent bond
  • The distance between the nucleus and the outermost electron of an atom
  • The distance between the nuclei of two atoms of different elements joined together by a single covalent bond
  • Half the distance between the nuclei of two atoms of the element joined together by a single covalent bond (correct)

    • What is the main reason for the decrease in atomic radius across a period?

  • Increase in atomic mass
  • Decrease in nuclear charge
  • Decrease in the number of energy levels
  • Increase in nuclear charge (correct)

    • What is the trend in electronegativity down a group?

  • Electronegativity increases due to increased screening effect
  • Electronegativity increases due to increased nuclear charge
  • Electronegativity decreases due to increased atomic radius (correct)
  • Electronegativity remains constant due to balancing factors

    • What is the 1st ionisation energy of an element?

    <p>The minimum amount of energy required to remove the most loosely bound electron</p> Signup and view all the answers

    What is the trend in 1st ionisation energy across a period?

    <p>1st ionisation energy increases due to increased nuclear charge</p> Signup and view all the answers

    What is the reason for the decrease in 1st ionisation energy down a group?

    <p>Increase in atomic radius</p> Signup and view all the answers

    What is the 2nd ionisation energy of an element?

    <p>The minimum amount of energy required to remove the most loosely bound electron from each singly charged positive ion</p> Signup and view all the answers

    Why does electronegativity increase across a period?

    <p>Due to decreased atomic radius and increased nuclear charge</p> Signup and view all the answers

    What is the primary reason for the increase in atomic radius down a group?

    <p>Extra energy levels</p> Signup and view all the answers

    Which of the following factors contributes to the decrease in electronegativity down a group?

    <p>Increased atomic radius</p> Signup and view all the answers

    What is the relationship between the atomic radius and the nuclear charge across a period?

    <p>As the nuclear charge increases, the atomic radius decreases</p> Signup and view all the answers

    What is the effect of increased screening on the 1st ionisation energy of an element?

    <p>It decreases the 1st ionisation energy</p> Signup and view all the answers

    What is the effect of the atomic radius on the electronegativity of an element?

    <p>As the atomic radius increases, the electronegativity decreases</p> Signup and view all the answers

    What is the primary reason for the decrease in atomic radius across a period?

    <p>Increased nuclear charge</p> Signup and view all the answers

    What is the effect of the nuclear charge on the electronegativity of an element?

    <p>As the nuclear charge increases, the electronegativity increases</p> Signup and view all the answers

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