Atomic Number and Mass Number
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Questions and Answers

What is the atomic number defined by?

  • Number of protons and electrons
  • Number of protons and neutrons
  • Number of protons (correct)
  • Number of neutrons and electrons

    • How is the mass number of a single atom calculated?

  • Protons / Neutrons
  • Protons - Neutrons
  • Protons + Neutrons (correct)
  • Protons x Neutrons

    • Which subatomic particle is essentially without mass?

  • Protons
  • Electrons (correct)
  • Neutrons
  • Positrons

    • What is the common factor among all atoms of the same element?

    <p>Atomic number</p> Signup and view all the answers

    How are protons and electrons distinguished in terms of charge?

    <p>+1 charge for protons and -1 charge for electrons</p> Signup and view all the answers

    What is the charge of a neutron?

    <p>0</p> Signup and view all the answers

    How can one determine the atomic number of an element?

    <p>By looking at the periodic table</p> Signup and view all the answers

    What is the relationship between isotopes and mass numbers?

    <p>Isotopes have different mass numbers</p> Signup and view all the answers

    How is the mass number of an atom calculated?

    <p>A = Protons + Neutrons</p> Signup and view all the answers

    Which element has 14 protons and 15 neutrons in a specific isotope?

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

    What does the mass number of an element represent?

    <p>The number of protons + neutrons in an atom of the element</p> Signup and view all the answers

    How can one calculate the number of neutrons in an atom if given the atomic and mass numbers?

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

    Which statement is true about atomic and mass numbers?

    <p>Atomic numbers are unique to each element, while mass numbers vary for different isotopes.</p> Signup and view all the answers

    What is the relationship between atomic and mass numbers?

    <p>Atomic number is the number of protons, while the mass number is protons + neutrons.</p> Signup and view all the answers

    What distinguishes atomic number from mass number in terms of elements?

    <p>Atomic number is automatically known from the element's identity, while mass number must be determined based on neutrons.</p> Signup and view all the answers

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