Atoms



Atoms are the basic units of matter and the defining structure of elements. Atoms are made up of important particles : 
Protons ( positive particles ), neutorns (neural particles ) ,  electrons (negative particles),  and the small dense region consisting of protons and neurons at the center of an atom,  called nucleus .



       Reference-  What is  an atom, Disponivel em www.livescience.com/37206-atom-definition.html , acesso 2017 .

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