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    The effects o charge on the size of anions and cations

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    The following ions all have the same number of electrons: See attached file for full problem description.

    Order them according to their expected size, and explain answer.

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    Solution Preview

    Here are some points regarding ion sizes:

    * anions are larger than parent atoms
    * cations are smaller than parent atoms
    * atom size increases going down family (down a column in the periodic table). ion size also increases.

    Thus the order is (from smaller to larger):
    Ti < Sc < Ca < ...

    Solution Summary

    The solution explains why anions and cations have such huge difference in their size.