Final answer:
The Ca²+ ion is smaller than the Ca atom due to electron loss, resulting in a smaller size.
Explanation:
The Ca²+ ion is smaller than the Ca atom. This is because when an atom loses electrons to form a cation, the remaining electrons are pulled closer to the nucleus, resulting in a smaller size. In this case, the Ca²+ ion has a radius of 99 pm compared to the Ca atom's radius of 197 pm.
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