# Chemistry

Rank the ions in order of decreasing size.

Sr2+, Ba2+, Cs

Cs>Ba>Sr

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1. Cs>Ba2+>Sr2+ looks good to me.

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2. What is the difference between atomic radius, and atomic size

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3. 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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