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Hello, I usually consider the same reasoning for any type of radius for atoms. The trends I have noticed is that as you go down a group the radius increases. As you go from right to left in a period the radius increases. Also, radius increases as you go from the top right corner to the bottom left. Hope this helps!
Look at the nuclear charge of the isoelectric anions/cations/atoms. The higher the nuclear charge, the smaller the atom/cation/anion will be because the electrons will have a stronger pull inward thereby making the radius smaller.
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