

MCQOPTIONS
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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 | |