5 Questions
Who discovered the existence of neutrons?
J. Chadwick
What are the particles located at the outermost regions of an atom called?
Electrons
What did J. J. Thomson discover in 1897?
Negatively charged particles
Who discovered that anode emitted positively charged particles known as Canal rays or later named as Protons?
Ernest Goldstein
What did Ernest Goldstein discover in 1886?
Positively charged particles
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.
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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