Atomic mass of an atom is present in the __________?
Correct answer: C. Nucleus
- A. Shell
- B. Orbit
- C. Nucleus
- D. Orbital
Explanation
Nearly all an atom's mass is concentrated in its nucleus because it contains the relatively heavy protons and neutrons, whereas electrons have extremely small mass. The likely distractor is the shell, but shells describe regions occupied by electrons rather than the location of most atomic mass.
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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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