Atomic Mass Number and Actual Atomic Mass Quiz
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Questions and Answers

What is the most important factor affecting nuclear stability?

  • Number of electrons
  • Number of protons
  • N/P ratio (correct)
  • Number of neutrons

    • Why do neutrons contribute to the stability of a nucleus?

  • Due to their positive charge
  • Because they contribute to coulombic forces
  • Because they are lighter than protons
  • They help prevent proton-proton repulsions (correct)

    • What happens when a nucleus contains too few neutrons and protons?

  • It becomes stable
  • Its atomic mass decreases
  • It undergoes radioactive decay (correct)
  • It emits gamma radiation

    • In stable nuclei, what trend is observed when plotting Neutron against Proton?

    <p>A band curving towards neutrons in high atomic mass elements</p> Signup and view all the answers

    What do neutron-rich atoms typically have in common?

    <p>Z greater than 80</p> Signup and view all the answers

    What happens when a nucleus emits an alpha particle?

    <p>It loses 2 units of positive charge</p> Signup and view all the answers

    What is the outcome if a nucleus is extremely unstable?

    <p>It emits gamma radiation</p> Signup and view all the answers

    What do stable atoms follow on a plot of Neutron against Proton?

    <p>$N/Z = 1$ line at 45 degrees</p> Signup and view all the answers

    What is the significance of the N/P ratio in a nucleus?

    <p>$N/P$ ratio affects the stability of a nucleus</p> Signup and view all the answers

    Why are more neutrons required as the number of protons in the nucleus increases?

    <p>$Z$ leads to heavier elements requiring more neutrons for stability</p> Signup and view all the answers

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