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How would you determine the relative atomic sizes of a neutral atom and an ion?

I can't figure this out. It can't be that all neutral atoms are always smaller than all ions can it?

For example, how would I determine if Cl- is smaller or larger than S?.

(The answer is that Cl- is larger than S).

Is there a rule that applies to all comparisons of neutral atoms and ions?

For example, how would I determine if Na is smaller or larger than Cl-?

Thank you very much!

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# Relative Atomic Radii (Atoms and Ions)

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