Which of the following pairs is an isobar

  • A

    $_1{H^1}$ and $_1{H^2}$

  • B

    $_1{H^2}$ and $_1{H^3}$

  • C

    $_6{C^{12}}$ and $_6{C^{13}}$

  • D

    $_{15}{P^{30}}$ and $_{14}S{i^{30}}$

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