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Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions. An atom of sodium has one 3s electron outside a closed shell, and it takes only 5.14 electron volts of energy to remove that electron. The chlorine lacks one electron to fill a shell, and releases 3.62 eV when it acquires that electron (it's electron affinity is 3.62 eV).
NaCL is ionic bond due to presence of positive charge on Na+ (sodium ion) and negative charge on CL- (chloride ion ) which cause attractive force between them and formation of the ionic bond between two ions ....not covalent bond as there isn't participation between two atoms Na and CL. Related Questions.