[xshadow]

Hi

I know that in a  solution the I^- is less basic than Cl^- because it's more stable due to its negative charge is spread on a bigger volume than Cl-


Now If I look at the Electron affinity for the GAS phase I have an opposite trend:
Cl^->F^->Br^->I^-

In other words  this means that Cl^- has a better affinity to gain an electron becoming Cl^-. 
Better affinity (in gas phase) also means that Cl^- should be more stable than I^-  ,and so is a weaker base than iodine


Why I have this opposite basicity  trend when I see at electron affinity for the gas phase?
Thanks

[AWK]

Check definitions of basicity and electron affinity.

[xshadow]

Check definitions of basicity and electron affinity.

Hi
basicity, for example:

Cl^- + H⁺ ----> HCl



electron affinity:

Cl^- ---->  Cl + e^-


Do you mean that there isn't a correlation between electron affinity and basicity??


Cl has a higher electron affinity than Br, for example.
This means that the formation of Cl^- is preferred ....compared to  Br^- formation  (higher electron affinity for Cl)
But if the formation of Cl- is favorite this means that is more stable....

But I know instead that Cl- is less stable  than Br- because its negative charge  is spread on a smaller volume.