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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).
The compound that contains both covalent and ionic bonds is the compound of NH4Cl ( ammonium chloride). The Nitrogen atoms in combination with the Hydrogen atoms form the covalent bonds. The Ammonium ion (the cation) and Chlorine ion (the anion) form the ionic bonds of the polyatomic ionic combination.