The number of fundamental particles in an atom of the lightest isotope carbon are_______________?
Correct answer: C. 18
- A. 6
- B. 12
- C. 18
- D. 20
Explanation
The lightest isotope of carbon is carbon-12, containing 6 protons, 6 neutrons and 6 electrons. Therefore, the total number of fundamental particles is 6 + 6 + 6 = 18 particles. Students may choose b because 12 is the mass number, which counts only protons and neutrons.
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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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