Medical Definition of HYDANTOIN. 1. : a crystalline weakly acidic imidazole derivative C3H4N2O2 with a sweetish taste that is found in beet juice and used in organic synthesis.2. : a derivative of hydantoin (as phenytoin).What made you want to look up hydantoin?. : a crystalline weakly acidic imidazole derivative C3H4N2O2 with a sweetish taste that is found in beet juice and used in organic synthesis. 2. : a derivative of hydantoin (as phenytoin).
Fun Facts About Argon. Argon is one of the many elements in the Periodic Table. Its normal phase is gas, and it is in the family of Noble Gases. Its symbol is Ar., and its atomic number is eighteen. There are also eighteen protons, twenty-two neutrons, and eighteen electrons in argon. This element boils at -186.0 degrees Celsius and melts at -189.3 degrees Celsius.
The main isotopes of argon found on Earth are 40Ar (99.6%), 36Ar (0.34%), and 38Ar (0.06%). Naturally occurring 40K, with a half-life of 1.25 Ã 10 years, decays to stable 40Ar (11.2%) by electron capture or positron emission, and also to stable 40Ca (88.8%) via beta decay.n the universe, argon-36 is by far the most common argon isotope, being the preferred argon isotope produced by stellar nucleosynthesis in supernovas. In addition, argon is the most prevalent of the noble gases in Earth's crust, with the element composing 0.00015% of this crust.