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| Q. |
The atomic number of a certain element is 83. An atom of this element must contain |
| A. | 42 protons and 41 electrons |
| B. | 83 neutrous |
| C. | 1 neutron, 41 electrons and 41 protons |
| D. | 83 electrons |
| E. | None of the above is valid |
| Answer» D. 83 electrons | |
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