Which of the following is a neutral particle ?
Correct answer: B. Neutron
- A. Alpha particle
- B. Neutron
- C. Electron
- D. Proton
- E. All of these
Explanation
A neutron has no net electric charge, so it is electrically neutral, whereas an alpha particle and proton are positive and an electron is negative. Students may choose “all of these” by confusing neutral matter with neutral particles, but the charged particles are not neutral.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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