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Though they are found rare, they have many uses. Justify this statement.

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Helium, Neon, Argon, Krypton, Xenon and Radon are called the Noble or rare gases and are placed in group 18 in the periodic table. They are monoatomic and do not react with other substances easily. Though these gases are chemically inert, they have stable electronic . structures which are difficult to change. 

Their uses are as follows -

1. Helium has a very low density and used for filling weather ballon. 

2. Neon gas is used in discharge lamps. 

3. Argon is filled in electrical bulbs to prevent evaporation of the filament. 

4. Radon is a radioactive gas

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