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O, O2-, S2-, and Se2-

O is smaller than O2- because O2- has 2 extra electrons but the same amount of protons as O, so they are held less tightly and the atom is bigger. Atom size increases as you move down the Periodic Table, so O2- < S2- < Se2-.

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Q: Place the following atoms or ions in order of increasing radius O O2- S2- and Se2-?
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