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CsI vs CsF stability
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xshadow:
Which one is the most stable?
I'v seen some datas:
melting point: CsF > CsI
lattice energy: CsF > CsI
hard soft interaction : CsI compound is preferred because both ions are soft
Now according to hard soft CsI is the favoured product....but according to the lattice energy and the melting point CsF should be the most stable (better interaction between ions,more negative lattice energy)...so which one is the most stable?!
thanks
chenbeier:
Flouride has the highest electronegativity. Accept very strong 1 electron. Caesium (beside Francium) has the lowest one, it will donate very easy an electron. So the compound will be more stable. Also is Caesium a big ion and flouride a small one. Iodide is also a big one, what lowest the bonding force.
xshadow:
--- Quote from: chenbeier on January 13, 2021, 12:43:44 PM ---Flouride has the highest electronegativity. Accept very strong 1 electron. Caesium (beside Francium) has the lowest one, it will donate very easy an electron. So the compound will be more stable. Also is Caesium a big ion and flouride a small one. Iodide is also a big one, what lowest the bonding force.
--- End quote ---
you are saying that CsF is more stable than CsI cause electronegativity of fluoride....ok
BUt why according the Hard-soft theory CsI will be predominant against CsF because in CsI we have two soft ions (softs-soft interaction are favourite against soft-hard like CsF)...is in contraddition with the argument of the electronegativity...
thanks
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