Structure of the Atom: Charged Particles and Atomic Divisibility
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Questions and Answers

Who identified the presence of the electron?

  • J.J. Thomson (correct)
  • Ernest Rutherford
  • E. Goldstein
  • Marie Curie
  • What are the canal rays discovered by E. Goldstein?

  • Negatively charged radiations
  • Positively charged radiations (correct)
  • Gamma radiations
  • Neutral radiations
  • What is the charge of a proton?

  • Minus two
  • Minus one
  • Plus two
  • Plus one (correct)
  • What is the mass of an electron compared to the mass of a proton?

    <p>Approximately 2000 times less</p> Signup and view all the answers

    How was the atom thought to be composed based on the discovery of protons and electrons?

    <p>Composed of protons and electrons balancing their charges</p> Signup and view all the answers

    What did E. Goldstein's discovery of canal rays ultimately lead to?

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

    What was the big question regarding the structure of atoms?

    <p>What sort of structure do the particles of the atom form?</p> Signup and view all the answers

    According to Dalton's atomic theory, what was the nature of the atom?

    <p>The atom was indivisible and indestructible.</p> Signup and view all the answers

    Who was the first scientist to propose a model for the structure of an atom?

    <p>J.J. Thomson</p> Signup and view all the answers

    What was the main challenge for scientists at the end of the 19th century?

    <p>To reveal the structure of the atom and explain its important properties.</p> Signup and view all the answers

    What did J.J. Thomson propose about the structure of an atom?

    <p>The atom consists of a positively charged sphere and the electrons are embedded in it.</p> Signup and view all the answers

    What led to the failure of Dalton's aspect of atomic theory?

    <p>The discovery of protons inside the atom.</p> Signup and view all the answers

    What did J.J. Thomson's model explain about atoms?

    <p>Atoms are electrically neutral.</p> Signup and view all the answers

    What were scientists trying to reveal about atoms based on a series of experiments?

    <p>The arrangement of sub-atomic particles within the atom.</p> Signup and view all the answers

    'What makes the atom of one element different from the atom of another element?' is an example of:

    <p>A rhetorical question.</p> Signup and view all the answers

    According to Thomson's model, what are atoms composed of?

    <p>A positively charged sphere with embedded electrons</p> Signup and view all the answers

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