Element
- argon
A colorless and odorless inert gas; one of the six inert gases; comprises approximately 1%...
- helium
A very light colorless element that is one of the six inert gasses; the most difficult gas...
- krypton
A colorless element that is one of the six inert gasses; occurs in trace amounts in air.
- neon
A colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six...
- radon
A radioactive gaseous element formed by the disintegration of radium; the heaviest of the...
- xenon
A colorless odorless inert gaseous element occurring in the earth's atmosphere in trace a...