Multiple choice

Neutron was discovered by

  1. Fleming

  2. Becquerel

  3. J. J. Thomson

  4. Chadwick
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

James Chadwick discovered the neutron in 1932, confirming the existence of this neutral subatomic particle. Fleming discovered penicillin, Becquerel discovered radioactivity, and J.J. Thomson discovered the electron.

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