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

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In summary, the negative S values for F- and OH- ions are due to their high electronegativity and small size. Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond, and atoms with high electronegativity, like F- and OH-, have a strong attraction for electrons which results in a more negative S value. The smaller size of these atoms also contributes to their negative S values. A negative S value is important because it indicates stability and affects the reactivity of ions in chemical reactions.
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MaddenDude
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Why do F- and OH- have negative S values? (Entropy)

And are they the only ones with negative S values?
 
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The question isn't too meaningful without a context: aqueous? gas phase? Homework?
 
  • #3
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.
 
  • #4
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.
 

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

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

The negative S values for F- and OH- ions are due to their high electronegativity and small size.

What is electronegativity?

Electronegativity is a measure of an atom's ability to attract and hold onto electrons in a chemical bond.

How does electronegativity affect S values?

Atoms with high electronegativity, like F- and OH-, have a strong attraction for electrons. This means they are less likely to give up electrons and have a negative S value.

How does size impact S values?

Smaller atoms, like F- and OH-, have a stronger attraction for electrons because their outer electrons are closer to the nucleus. This results in a more negative S value.

Why is a negative S value important?

A negative S value indicates that the ion is stable and less likely to undergo a chemical reaction. This is important in understanding the reactivity of different ions in chemical reactions.

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