# Which isotope is more likely to bond with oxygen, C-12 or C-14?

The ""^12C isotope. Why?
So why is the ""^12C isotope more likely to bind? Simply because the ""^12C isotope is far more abundant, "approx. " 99%. There would exist both ""^13CO_2 and ""^14CO_2 in the atmosphere, but their abundance would reflect the isotopic distribution.