UnuNoble Gases- All these gases are full in electrons so they do not like to share any of the electrons. 

Helium- is used as a cooling medium for the Large Hadron Collider.

neon- is used in making the ubiquitous ‘neon signs’ for advertising.

Argon- is often used when an inert atmosphere is needed. 

Krypton- is used commercially as a filling gas for energy-saving fluorescent lights.

Xenon- is used in certain specialised light sources.

Radon- decays into radioactive polonium and alpha particles. This emitted radiation made radon useful in cancer therapy.

Ununoctium- At present, it is only used in research.