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Given elements belong to 3rd period.
Na = Sodium
Al = Aluminium
Cl = Chlorine
It takes more energy to remove an electron from a sodium atom to form an Na+ ion than we get back when this electron is added to a chlorine atom to form a Cl- ion. Once these ions are formed, however, the force of attraction between these ions liberates enough energy to make the following reaction exothermic.
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