MCQOPTIONS
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MCQOPTIONS
| 1. |
Which of the following is the lightest isotope used as a primary ion? |
| A. | He |
| B. | <sup>2</sup>He |
| C. | <sup>3</sup>He |
| D. | <sup>3</sup>H |
| Answer» D. <sup>3</sup>H | |