Respuesta :
Al3+ will have higher charge density.
Charge density of an ion is defined as the ratio of charge on an ion to its volume. The properties of ion that affects its charge density are magnitude of charge and volume of ion. Volume is governed by the size. More is the size of ion, more will be its volume. It is directly proportional to magnitude of charge and inversely proportional to volume of ion.
Sc and Al belong to third and thirteenth group of fourth and third period of periodic table respectively. Sc is larger in size than Al. Similarly, the size of Sc3+ is more than that of Al3+. The magnitude of charge in both the species is same but the volume, due to small size, of Al3+ is smaller than that of Sc3+. Hence, due to volume size, Al3+ will have higher charge density.
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