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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 Summary

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

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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 < ...

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