A helium nucleus comprising of two protons and two neutrons with a charge of 2e is _________ ?
Correct answer: C. Alpha particle
- A. Beta particle
- B. Gamma particle
- C. Alpha particle
- D. Negative particle
Explanation
An alpha particle is a helium-4 nucleus containing two protons and two neutrons, so its net charge is +2e. Beta particles are electrons or positrons and gamma particles are uncharged electromagnetic radiation, so selecting either usually reflects confusion between types of nuclear radiation.
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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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