# What are three isotopes of carbon?

""^12C. ""^13C, and ""^14C.
The heaviest isotope shown has a half life of about 6000 years (this is from memory, so check). The ""^13C isotope is abundant enough (approx. 1%) to make ""^13C NMR spectroscopy a routine method of characterization for organic chemists. Most universities would have 1 or more ""^13C NMR spectrometers. ""^12C isotope is the bog standard, naturally abundant one that you sprinkle on your cornflakes when it (the isotope) is bound to oxygen and hydrogen.