Charge density of an ion is defined as the ratio of charge of an ion to its volume. Scandium ion has high charge density than calcium ion.
Charge density of an ion is defined as the ratio of charge of an ion to its volume. Charge density also depends on size of the ion and valence electrons.
Scandium and calcium are IV periodic elements with atomic numbers of 21 and 20 respectively.
Scandium loses three electrons and has +3 charge and calcium is a divalent cation.
Hence, Scandium ion has high charge density than calcium ion.
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