Calculating Isotope Abundance for Chlorine Isotopes
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Questions and Answers

What is the formula for calculating the atomic weight using isotope abundance?

  • [(Percentage of isotopes)(atomic mass of 1st isotope)] + [(percentage of isotopes)(atomic mass of 2nd isotope)] (correct)
  • [(Mass number of isotopes)(atomic mass of 1st isotope)] + [(mass number of isotopes)(atomic mass of 2nd isotope)]
  • [(Number of protons)(atomic mass)] + [(Number of neutrons)(atomic mass)]
  • [(Atomic weight)(mass number of isotopes)] + [(Atomic number)(percentage of isotopes)]
  • In the example provided, what is the abundance percentage of Chlorine-37?

  • 24% (correct)
  • 54%
  • 76%
  • 46%
  • How many protons are present in Chlorine-35 isotope?

  • 35
  • 17 (correct)
  • 19
  • 18
  • Which law states that the physical and chemical properties of elements are a periodic function of their atomic masses?

    <p>Periodic Law</p> Signup and view all the answers

    What does the atomic number represent in an element's properties?

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

    Which term refers to the outermost electrons in an element's electronic configuration?

    <p>Valence electrons</p> Signup and view all the answers

    Which atomic property describes the ability of an atom to attract electrons in a chemical bond?

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

    In which direction does electronegativity trend across a period in the periodic table?

    <p>Increases from left to right</p> Signup and view all the answers

    What is the energy needed to remove an atom's most loosely held electron called?

    <p>Ionization energy</p> Signup and view all the answers

    Which element type usually attracts electrons and is considered electronegative?

    <p>Non-metal element</p> Signup and view all the answers

    What happens to ionization energy as you move from top to bottom in a group on the periodic table?

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

    Which atomic property measures the energy change when an atom gains a single electron and forms a negative ion?

    <p>Electron affinity</p> Signup and view all the answers

    What does the Law of Definite Proportions state?

    <p>A compound always contains the same elements in definite proportions by mass regardless of the sample size.</p> Signup and view all the answers

    Which statement describes the Law of Multiple Proportions?

    <p>When two elements form more than one compound, the ratios of the masses of the second element can be expressed as small whole numbers.</p> Signup and view all the answers

    What defines the atomic number of an atom?

    <p>The total number of protons in the nucleus.</p> Signup and view all the answers

    What is true about isotopes?

    <p>Isotopes have different mass numbers but same atomic numbers.</p> Signup and view all the answers

    If two elements form compounds with varying ratios of their masses, which law is being illustrated?

    <p>Law of Multiple Proportions</p> Signup and view all the answers

    In an isotope, if the atomic number is 12, what can we say for certain about the number of protons?

    <p>There are 12 protons.</p> Signup and view all the answers

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