Atomic Structure and Periodicity
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Questions and Answers

What is the approximate diameter of an atom?

  • $10^{-15}$ m
  • $10^{-5}$ m
  • $10^{-10}$ m (correct)
  • $10^{-20}$ m

    • What is the composition of the nucleus of an atom?

  • Protons and electrons
  • Protons and neutrons (correct)
  • Neutrons and electrons
  • Neutrons and positrons

    • Who proposed the theory that matter consists of indivisible particles called atoms?

  • Isaac Newton
  • Democritus (correct)
  • Galileo Galilei
  • Aristotle

    • Which particles are much heavier and constitute the majority of an atom's mass?

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

    What is the historical significance of Democritus' theory on atoms?

    <p>First proposed the concept of indivisible particles called atoms</p> Signup and view all the answers

    How small are the nuclei compared to the size of the atom?

    <p>About 100,000 times smaller</p> Signup and view all the answers

    What is the main component of an atom's nucleus?

    <p>Neutrons and protons</p> Signup and view all the answers

    Which part of an atom occupies almost all of the atom's volume?

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

    How does Democritus describe atoms in his theory?

    <p>Indivisible particles</p> Signup and view all the answers

    Which part of an atom is about 100,000 times smaller than the diameter of the atom?

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

    What is the main difference between the nucleus and the rest of the atom?

    <p>Nucleus is positively charged</p> Signup and view all the answers

    What is the approximate diameter of the nucleus of an atom?

    <p>$10^{-15}$ m</p> Signup and view all the answers

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