To easily determine the hybridization of the central atom, we need to look at the number of atoms attached to it and its number of lone pairs. The central atom is usually the element with the least number of atoms. Thus, the central atom is Al. Aluminum (Al) has 3 valence electrons. The (-) charge indicates that Aluminum accepts 1 electron. So, Al now has 4 valence electrons. There is a 4 Cl atom attached to Aluminum, so all of the electrons are paired.
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