He has two naturally occurring isotopes \( \mathrm{He}-3 \) and \( \mathrm{He} \) \( -4 \). The ...

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He has two naturally occurring isotopes \( \mathrm{He}-3 \) and \( \mathrm{He} \) \( -4 \). The average atomic mass of helium is \( 3.98 \mathrm{amu} \) which isotope is more abundant in nature
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