The natural relative abundance of isotopes of hydrogen is:

  • A
    $^1_1H = 99.985 \%; ^2_1D = 0.015 \%$
  • B
    $^1_1H = 99.985 \%; ^2_1D = 0.015 \%; ^3_1T = 10^{-16} \%$
  • C
    $^1_1H = 99.100 \%; ^2_1D = 0.900 \%$
  • D
    $^1_1H = 99.900 \%; ^2_1D = 0.10 \%; ^3_1T = 10^{-15} \%$

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