![]() The electron affinity, E ea for Cl is -349 kJ/mol and is favorable - energy is released. Recall, energy is required to remove an electron. The ionization energy, E i, for Na is +496 kJ/mol and is not favorable. An electron is transferred from a sodium atom to a chlorine atom. Sodium chloride is composed of Na ions and Cl ions. ![]() This creates an strong electrostatic attraction between a positively charged cation and a negatively charged anion. An ionic bond is a bond where one or more electrons is transferred from one atom to another. ![]() Ionic compounds are salts, and we all recognize table salt which is NaCl.
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