structure of Atom

Structure of Atom is all about atom and its formation through electron, Proton and Neutron there charges .the nature of atom will become anion and cation due to the gain of electron or loss of electron atom become anion or cation. and after that force of attraction will create some reaction because of that molecules form,so if we want to understand about reaction and formation of molecules and formation of anion or cation we first need to understand about the structure of Atom.