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3. Inert gases exist in the form of free atoms
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The group 18 elements include helium, neon, argon, krypton, xenon and radon. They are referred to as noble gases or inert gases. ... All of these elements occur in a free state in the atmosphere. They are colourless , tasteless and odorless gases.
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Because their all electronic shells including outermost shell of atoms are complete. So, they do not lose or gain their electrons in order to attain stability.Hence,they do not take part in chemical reactions. Thats why inert gases exist in the form of free atoms
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