The Maximum mass of an atom is present in ___________?
Correct answer: B. Nucleus
- A. Shell
- B. Nucleus
- C. Energy levels
- D. Orbit
Explanation
The nucleus contains protons and neutrons, which account for almost all of an atom's mass; the electrons in the shells have extremely small mass in comparison. Students may choose an energy level or shell because electrons occupy them, but electron mass contributes very little to the atom's total 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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