Why do F- and OH- have negative S values?

[MaddenDude]

Why do F- and OH- have negative S values? (Entropy)

And are they the only ones with negative S values?

 

[Bystander]

The question isn't too meaningful without a context: aqueous? gas phase? Homework?

 

[MaddenDude]

aqueous; its not homework, I'm just curious. In my book, all the S values are positive except those two, I'm just wondering why.

 

[Bystander]

Snoop around in the discussion of thermodynamic properties of ions a little more --- you'll find that they are relative to arbitrarily assigned zero values for H⁺ formation.