Atomic Numbers and Mass Numbers Quiz
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Questions and Answers

What is the atomic number of an atom?

  • The number of electrons
  • The sum of protons and neutrons
  • The number of neutrons
  • The number of protons (correct)

    • Which sub-atomic particle is not accounted for in the atomic number?

  • Electrons
  • Neutrons (correct)
  • Protons
  • Isotopes

    • What does the mass number represent in an atom?

  • The number of protons
  • The total number of sub-atomic particles
  • The sum of protons and neutrons (correct)
  • The number of electrons

    • Which element has an atomic number of 6 and a mass number of 12?

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

    What does the notation 'A Z x' represent for an element?

    <p>Atomic mass, atomic number, symbol</p> Signup and view all the answers

    Which of the following best describes a molecule of an element?

    <p>Consists of only one type of atom</p> Signup and view all the answers

    What is the relationship between the mass number and the atomic number in an atom?

    <p>Atomic number is less than the mass number</p> Signup and view all the answers

    Which sub-atomic particle has a charge but negligible mass?

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

    What is the main difference between monoatomic and polyatomic molecules?

    <p>Number of different types of atoms</p> Signup and view all the answers

    Which Greek philosopher first proposed the idea of 'atoms'?

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

    What is the atomic number of an element?

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

    What is the relationship between the number of protons, electrons, and atomic number in an atom?

    <p>Number of protons = Number of electrons = Atomic number</p> Signup and view all the answers

    Which subatomic particle is responsible for the mass of an atom?

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

    How can you calculate the number of neutrons in an atom?

    <p>Number of neutrons = Mass number - Atomic number</p> Signup and view all the answers

    In an atom with 8 protons, how many electrons are present?

    <p>8</p> Signup and view all the answers

    What is the relationship between the mass number and atomic number in an atom?

    <p>Mass number &gt; Atomic number</p> Signup and view all the answers

    If an element has 6 protons and 6 neutrons, what is its atomic number?

    <p>6</p> Signup and view all the answers

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