MCQOPTIONS
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| 1. |
Which one of the following elements will be an isobar of calcium if the atomic number of calcium is 20 and its mass number is 40? |
| A. | Element with 18 neutrons and 20 protons |
| B. | Element with 19 neutrons and 18 protons |
| C. | Element with 19 neutrons and 20 protons |
| D. | Element with 22 neutrons and 18 protons |
| Answer» E. | |