Discovered in: 1900

Discovered by: Friedrich Dorn of Germany

Description: This element was originally named niton, but changed to radon (named for the element radium, which decays into radon) in 1923. Radon is a colorless, odorless, gas and is the heaviest gaseous element. Radon is a noble gas, so it is chemically inert. It is also highly radioactive, eventually decaying into lead. Radon has the interesting characteristic of glowing brightly when it is cooled below its freezing point. Radon is used in cancer treatment. It also has an interesting use in earthquake prediction. The most stable isotope of radon has a half-life of 3.8 days.

Biological Rating: No known benefit for life processes in plants and animals.

Biological Benefits: Radon has no known biological use.

Percentage Amount in the Human Body: 0 %

Obtained from: Radon is a decay product of uranium, thorium and radium. Consequently, it is found emanating from minerals containing those elements. It is a danger in uranium mines, and homes built in areas with concentrations of uranium find radon gas seeping into their basements, creating a health hazard for the occupants. It is also occasionally found dissolved in certain hot spring waters.