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I know that both atomic and ionic radii follow the same trend on the periodic table. Generally, radius decreases moving across a period (row) and increases moving down a group (column). As for covalent, I'm not 100% sure and I don't want to give you the wrong information. Sorry.
The only difference is in the cations and anions that form the ionic bonds. Cations are smaller than their parent atoms because they have a more positive charge and the nucleus holds more tightly to its electrons. And anions are bigger than their parent atoms because they have more electrons to experience electron-electron repulsion.
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