Gr 10 Physical Sciences Ch 2: Isotopes
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Questions and Answers

What is the origin of the term 'isotope'?

  • From the German words 'iso' and 'topos'
  • From the Latin words 'iso' and 'topos'
  • From the French words 'iso' and 'topos'
  • From the Greek words 'iso' and 'topos' (correct)

    • What is the characteristic that is identical in isotopes of an element?

  • Number of protons
  • Atomic mass number
  • Chemical properties (correct)
  • Physical properties

    • How are isotopes often represented?

  • Using the element symbol and atomic mass number (correct)
  • Using the element symbol and number of neutrons
  • Using the element symbol and atomic number
  • Using the element symbol and number of electrons

    • What is the reason for the difference in physical properties of isotopes?

    <p>Difference in number of neutrons</p> Signup and view all the answers

    What is the average atomic mass of an element influenced by?

    <p>The relative abundance of its isotopes</p> Signup and view all the answers

    What is the formula to calculate the average atomic mass of an element with multiple isotopes?

    <p>Average Atomic Mass = (Atomic Mass of Isotope 1 × % Isotope 1) + (Atomic Mass of Isotope 2 × % Isotope 2)</p> Signup and view all the answers

    What is the percentage of Cl-35 in chlorine atoms?

    <p>75% of chlorine atoms</p> Signup and view all the answers

    What is the symbol for the isotope of chlorine with 17 protons and 18 neutrons?

    <p>Cl-35</p> Signup and view all the answers

    What is the primary reason why isotopes occupy the same place on the periodic table?

    <p>They have the same number of protons.</p> Signup and view all the answers

    What is the difference between the atomic mass number of Cl-35 and Cl-37?

    <p>2 u</p> Signup and view all the answers

    What is the effect of different neutrons on the physical properties of isotopes?

    <p>It affects the stability.</p> Signup and view all the answers

    What is the purpose of calculating the average atomic mass of an element?

    <p>To take into account the relative abundances of its isotopes.</p> Signup and view all the answers

    What would happen if an element had only one isotope?

    <p>The average atomic mass would be equal to the atomic mass of the isotope.</p> Signup and view all the answers

    Why do isotopes of an element have the same chemical properties?

    <p>Because they have the same number of protons and electrons.</p> Signup and view all the answers

    What would be the result of miscalculating the relative abundance of an isotope?

    <p>An incorrect average atomic mass would be calculated.</p> Signup and view all the answers

    What is the importance of considering the relative abundance of isotopes in calculating the average atomic mass?

    <p>To accurately reflect the weighted average of the atomic masses of the isotopes.</p> Signup and view all the answers

    What is the main reason why isotopes of an element have different physical properties?

    <p>Difference in the number of neutrons</p> Signup and view all the answers

    What is the significance of the atomic mass number in isotopes?

    <p>It represents the total number of nucleons in the nucleus</p> Signup and view all the answers

    Why do chlorine atoms have an average atomic mass that is not a whole number?

    <p>Because chlorine has different isotopes with different atomic masses</p> Signup and view all the answers

    What is the purpose of calculating the relative abundance of isotopes?

    <p>To calculate the average atomic mass of an element</p> Signup and view all the answers

    What would be the effect of an element having only one isotope?

    <p>The element would have an average atomic mass that is a whole number</p> Signup and view all the answers

    Why do isotopes of an element have the same place on the periodic table?

    <p>Because they have the same number of protons and electrons</p> Signup and view all the answers

    What would happen if the relative abundance of an isotope were miscalculated?

    <p>The average atomic mass of the element would be incorrect</p> Signup and view all the answers

    What is the reason why the atomic mass of an element is not always an integer?

    <p>Because the element has different isotopes</p> Signup and view all the answers

    What is the primary reason why isotopes of an element have different atomic mass numbers?

    <p>Different number of neutrons</p> Signup and view all the answers

    Which of the following statements is true about isotopes of an element?

    <p>They have different chemical properties due to different numbers of neutrons</p> Signup and view all the answers

    What is the result of considering the relative abundance of isotopes in calculating the average atomic mass of an element?

    <p>The calculated average atomic mass is affected by the atomic mass number of the most abundant isotope</p> Signup and view all the answers

    What is the main purpose of distinguishing between isotopes of an element?

    <p>To understand the physical properties and abundance of the element</p> Signup and view all the answers

    Which of the following is a consequence of isotopes occupying the same place on the periodic table?

    <p>They have the same atomic number</p> Signup and view all the answers

    What is the effect of the number of neutrons on the chemical properties of isotopes?

    <p>It has no effect on the chemical properties</p> Signup and view all the answers

    How does the relative abundance of isotopes influence the average atomic mass of an element?

    <p>It affects the average atomic mass proportionally to the abundance</p> Signup and view all the answers

    What is the relationship between the atomic mass number and the number of neutrons in an isotope?

    <p>The atomic mass number is the sum of protons and neutrons</p> Signup and view all the answers

    What is the main difference between isotopes of an element?

    <p>Number of neutrons</p> Signup and view all the answers

    Why do isotopes of an element have identical chemical properties?

    <p>Because they have the same number of protons and electrons</p> Signup and view all the answers

    What is the purpose of calculating the average atomic mass of an element?

    <p>To account for the relative abundance of isotopes in an element</p> Signup and view all the answers

    What is the relative abundance of Cl-35 in chlorine atoms?

    <p>75%</p> Signup and view all the answers

    What is the effect of having different numbers of neutrons on isotopes?

    <p>Different physical properties</p> Signup and view all the answers

    What is the result of calculating the average atomic mass of an element with multiple isotopes?

    <p>A decimal value</p> Signup and view all the answers

    Why do isotopes of an element occupy the same place on the periodic table?

    <p>Because they have the same number of protons</p> Signup and view all the answers

    What is the significance of the atomic mass number in isotopes?

    <p>It represents the sum of protons and neutrons</p> Signup and view all the answers

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