Alpha (α) particles are helium (He) nucleus with a charge of __________ ?
Correct answer: B. 2e
- A. e
- B. 2e
- C. 3e
- D. 4e
Explanation
An alpha particle is a helium nucleus with two protons, and each proton contributes a charge of +e, giving a total charge of +2e. The likely wrong choice is 4e, which incorrectly treats the two neutrons as charged particles.
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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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