why is the formula for aluminium chloride al2cl6 and not alcl3
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Aluminum has only 3 valence electrons and therefore forms three single covalent bonds with Chlorine atoms but AlCl3 leaves the Aluminium atom with only 6 electrons in its outer shell, rather than the desired Octet but each AlCl3 molecule contains three Chlorine atoms that have lone pairs of electrons uninvolved in bonding.
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