Which one of the following statements is correct?
- A. A neutron is formed by combination of an electron and a proton. Therefore, it is neutral
- B. The mass of an electron is about 1/2000 times that of a proton ✓
- C. An isotope of cobalt is used in the treatment of goiter
- D. J. J. Thomson proposed that the nucleus of an atom contains only neutrons
Correct Answer: B. The mass of an electron is about 1/2000 times that of a proton
Explanation
The mass of an electron is approximately 1/1836 (or about 1/2000) of the mass of a proton.
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