The nucleus of an atom of every element will always contain____________________?
Correct answer: C. protons
- A. neutrons
- B. protons and electrons
- C. protons
- D. protons and neutrons
Explanation
The atomic number of an element is defined by its number of protons, so every atomic nucleus contains at least one proton. The nucleus of ordinary hydrogen-1 has a proton but no neutron, and electrons are outside the nucleus. The likely mistake is choosing d by assuming that every nucleus must contain both 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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