What is an inert gas and Nobel gas

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Inert gases or Noble gases
 
    The element which belong to the group 18 of the periodic table are known as inert gassg or noble gases. They have 8 electron (except he) in their out most shell . Therefore
 their combining capacity or valency is zero . Hence, they are inert in nature . However, recently it was discovered that these elements from a number of compound with high electromagnetic element , Example- oxygen and fluorine . Now these elements are known as noble gases . These are chemically rather unreactive as compared to other elements.

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