Which of the following contains two species which have the same mass number? A) ¹⁴C, ¹⁴N B) ¹²C, ¹³C C) both a and b D) neither a nor b

Question

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Both ¹⁴C and ¹⁴N have a mass number of 115, as they both have 114 neutrons and 1 proton. Option B has two species with different mass numbers, as ¹²C has a mass number of 113 and ¹³C has a mass number of 114.

Which of the Following Contains Two Species Which Have the Same