Although the easier ionization of radon leads one to expect the most extensive chemistry for that element, the high instability of even the most stable isotope has severely limited studies of it.

From the Angle of physical organic Chemistry, the transition state of chemical reactions has been studied in chemical reaction rate and isotope effect.

This paper discussed the rule of CO_2 degassing from deep faults hotsprings in Yunnan by analysis of the geology background, environment condition, chemistry of water and carbon, helium isotope.