He has two naturally occurring isotopes \( \mathrm{He}-3 \) and P \...

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He has two naturally occurring isotopes \( \mathrm{He}-3 \) and
P \( \mathrm{He}-4 \). The average atomic mass of helium is 3.98

W amu which isotope is more abundant in nature.
(A) \( \mathrm{He}-4 \)
(B) \( \mathrm{He}-3 \)
(C) both are equally abundant
(D) none of these
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