Structure of an Atom Class 9 Quiz
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Questions and Answers

Who discovered the existence of neutrons?

  • J. Chadwick (correct)
  • J. J. Thomson
  • Niels Bohr
  • Ernest Goldstein
  • What are the particles located at the outermost regions of an atom called?

  • Electrons (correct)
  • Neutrons
  • Protons
  • Positrons
  • What did J. J. Thomson discover in 1897?

  • Protons
  • Negatively charged particles (correct)
  • Positively charged particles
  • Neutrons
  • Who discovered that anode emitted positively charged particles known as Canal rays or later named as Protons?

    <p>Ernest Goldstein</p> Signup and view all the answers

    What did Ernest Goldstein discover in 1886?

    <p>Positively charged particles</p> Signup and view all the answers

    Study Notes

    Atomic Structure and Discoveries

    • James Chadwick discovered the existence of neutrons.

    Atomic Components

    • Electrons are located at the outermost regions of an atom.

    J.J. Thomson's Discovery

    • In 1897, J.J. Thomson discovered electrons.

    Proton Discovery

    • In 1886, Eugen Goldstein discovered that the anode emitted positively charged particles, later named as Canal rays or Protons.

    Ernest Goldstein's Discovery

    • In 1886, Ernest Goldstein discovered Canal Rays.

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    Description

    Test your knowledge of the fundamental constituents of an atom, different models of an atom, distribution of electrons, and valence electrons with this quiz based on the chapter 'Structure of an Atom' from class 9 Science.

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