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.
From Wikipedia, the free encyclopedia. Argon (Ar) has 24 known isotopes, from 30 Ar to 53 Ar and 1 isomer (32m Ar), three of which are stable, 36 Ar, 38 Ar, and 40 Ar. On Earth, 40 Ar makes up 99.6% of natural argon. The longest-lived radioactive isotopes are 39 Ar with a half-life of 269 years, 42 Ar with a half-life of 32.9 years, and 37 Ar with a half-life of 35.04 days.