MCQOPTIONS
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MCQOPTIONS
| 1. |
The mass number of a substance represents the sum of total number of |
| A. | Protons and neutrons in an atom |
| B. | Protons and electrons in an atom |
| C. | Neutrons and electrons in an atom |
| D. | Protons and neutrons in a nucleus |
| Answer» E. | |