Neon is the 10th element of the periodic table. It is a gas. It is most common in advertising signs like the ones on the side of restaurants. It forms no known compounds.
Argon is the 18th element of the periodic table. It is a gas. It is used in light bulbs to keep the filament from reacting with oxygen.
Krypton is the 36th element of the periodic table of elements. It is a gas. It is used in photographic flashes in high speed cameras. Some light bulbs are filled with it and argon.
Xenon is the 54th element of the periodic table. It is a gass. It is used in strobe lights because it flashes a bright white light when electrically charged. Its light is also used to kill bacteria.
Radon is the 86th element of the periodic table of elements. It is a radioactive gas. The only practical use it to help cure some cancers.
