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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).
All you have to remember most importantly, is that Ionic is metal + non-metal For examples, in KCl, Potassium is an alkali metal and Chloride is a hallide (non-metal) In SiCl4, Silicon and Chlorine are both non-metals so form a covalent bond (and atoms that form this bond are termed molecules).ut there are also complex ions such as NH4+ and SO42- which form ionic bonds despite containing non metals. So best way is to remember the valency or charge of each simple or complex ion. A compound consisting of a cation(+ ve charge) and an anion(-ve charge) will be instantly recognized as ionic. Bittu Â· 3 years ago.