Chemistry Atomic Structure DUHS 2024
PMDC Verified Question 12 of 95
The neutron was discovered by
A
Max Planck
B
Chadwick
C
J.J. Thomson
D
Goldstein
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Chadwick
Concept: The neutron was the last of the three major subatomic particles to be discovered because it carries no electrical charge, making it difficult to detect with electromagnetic fields.

Formula: None required.

Solution:
  • In 1932, Sir James Chadwick bombarded Beryllium with alpha particles.
  • He observed highly penetrating, uncharged radiation being emitted.
  • He proved that this radiation consisted of neutral particles with a mass slightly greater than a proton. He named this particle the neutron.


Why other options are incorrect: J.J. Thomson discovered the electron. Eugen Goldstein discovered positive rays (protons/canal rays). Max Planck discovered quantum energy packets (photons).

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