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Rank the ions in order of decreasing size.

Sr2+, Ba2+, Cs

Cs>Ba>Sr

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Cs>Ba²⁺>Sr²⁺ looks good to me.

What is the difference between atomic radius, and atomic size

I think of atomic size as the diameter or spherical size (volume) whereas the radius is 1/2 the diameter. The small periodic chart I have at home lists the volume.

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