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All we know about atom is that electrons are in valence cell , & revolve Around nucleus & nucleus is made up of protons & neutrons .

Actually protons & electrons attract each other in a nucleus but At the same time a Force acts on it which cause it to revolve around it , name given to that force is centrifugal force , it pushes the electrons outside & protons attract electrons inside , So , an equillibrium is attained , thats why it doesnt fall into the nucleus
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