What is the valency of aluminum and chlorine?
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Aluminium chloride doesn't have valency. It is a compound and the valencies of constituent atoms are satisfied. Aluminium had a valency of + 3 and each chlorine atom had a valency of -1.
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The atomic number of chlorine is 17 ,so its electronic configuration is 2, 8, 7 . ... Aluminium chloride contains aluminium ions Al³+ and chloride ions Cl-. Now the valency of aluminium ion Al³+ and is 3 and that of chloride ion is 1. So one aluminium ion Al³+ will unite with 3 chloride ions to form AlCl3
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