Which is the bigger ion, F- or O-?

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definitely $\ce{O-}$

In $\ce{O-}$ 7 outer electrons are tied to nuclei with 6 positive charges (number 8 minus 2 electons of inner shell), while in $\ce{F-}$ 8 outer electrons are tied to nuclei with 7 charges. The difference, however, should be quite small.

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Updated on September 08, 2020

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  • sedflix
    sedflix about 3 years

    Well, according to the proton-electron ratio $\ce{O-}$ should be bigger than $\ce{F-}$

    What about the charge/electron density in $\ce{F}$? Will it not affect the size of the atom of $\ce{F-}$?

    • ashu
      ashu about 9 years
      I think $\ce{O-}$ is the bigger guy. Since $\ce{F-}$ have a complete octet and also have more protons than $\ce{O-}$.
    • EJC
      EJC about 9 years
      @Siddharth Yadav, What about the charge/electron density in O?