Elements which emit natural radioactivity are known as __________ ?
Correct answer: C. Radioactive elements
- A. Radio elements
- B. Active elements
- C. Radioactive elements
- D. Nuclear elements
Explanation
Elements that spontaneously emit alpha, beta or gamma radiation from unstable nuclei are called radioactive elements. “Radio elements” may be chosen because it sounds shorter, but it is not the standard scientific term.
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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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