xenon
zee non
- n a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
- Xenon 129 is a rare xenon isotope that is the descendant of iodine 129, a radioactive form of iodine that was created with the rest of the elements that formed the solar nebula and .
- Dawn, by contrast, should have enough xenon left over after its Ceres stay that mission planners might even consider sending it on to a third destination.
- The water gave off radioactive xenon and krypton gases that escaped through the plant's ventilation system into the atmosphere.