WHICH_OF_THE_FOLLOWING_IS_THE_LIGHTEST_ISOTOPE_USED_AS_A_PRIMARY_ION?? – 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

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