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Always remember that cationic radii is always smaller than radii of parent atom whereas anionic radii is always larger than that of parent Which gives us the conclusion that $H^- > H >H^+$ The 2nd option is correct noble gases in a period have highest ionization energies and since fluorine is more electronegative than oxygen it has a higher ionization ...


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Put very roughly, we can boil this down to why aluminum and sulfur are depressed with respect to the average of the surrounding elements. Aluminum is $\ce{[Ne]{3}s^2{3}p^1}$. Its first ionization removes the $3p$ electron while leaving the more stable $3s$ orbital intact, whereas magnesium has to break its more stable $3s$ orbital. So by comparison, the ...


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