A reaction in which oxidation numbers change is the answer! :D
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I dont understand , what u write
I’m pretty sure it’s D. Hope that helps! Correct me if I am wrong.
Carbon-13 has 7 neutrons and carbon-12 has 6 neutrons. Carbon-12 is the most common isotope of carbon. Carbon-14 is radioactive and very rare. The symbols for the isotopes of carbon atoms shown here indicate they each have six protons but mass numbers of 14, 13 and 12.