neon and argon is inert gas because they are more stable than other.

Uses of Neon:
(i) Neon is mainly used in fluorescent lamps of tubes for advertising purposes. These are known as neon signs and can be seen at long distances even when there is a fog. Neon actually produces an orange red glow in the tube and on mixing with the vapours of other gases, glows or signs of different colours can be obtained.

(ii) It is used in filling sodium vapour lamps.

(iii) It is used in safety devices for protecting certain electrical instruments (voltmeters, relays, rectifiers etc.)

Uses of Argon:
(i) It is used in metal filament electric lamps since it increases the life of the tungsten filament by retarding its vapourisation.

(ii) A mixture of argon and mercury vapours is used in fluorescent tubes.

(iii) It is used to create an inert atmosphere for welding and for carrying certain chemical reactions.