Which of the following isotopes have 8 neutrons in the nucleus?
O-15
O-17
C-13
C-14

C-14 have 8 neutrons in the nucleus.

Carbon atoms with 8 neutrons have an atomic mass of 14 (6 protons + 8 neutrons = 14), so this isotope of carbon is named carbon-14.

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Explanation:

The answer to this question would be C-14

Explanation:

To determine this value simply take the mass number for each of these elements and figure out the one that gives you the value of 8 neutrons by subtracting it by the number of protons that there are for each element. You will find that only the last one is the correct choice.