Which of the following contains two species which are a pair of isotopes? A) ¹⁴C and ¹⁴N B) ¹²C and ¹³C C) both 14_Cand 14_Nand 12_Cand 13_C D) neither 14_Cand 14_Nor 12_Cand 13_C

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Isotopes are atoms of the same element (same number of protons) with different numbers of neutrons, thus different mass numbers. Choice B shows two species of carbon (C) with different mass numbers (112 and 113), indicating they are isotopes of each other.

Which of the Following Contains Two Species Which Are a Pair