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Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: Rayan on June 10, 2005, 03:44:11 PM

Title: thalium stability
Post by: Rayan on June 10, 2005, 03:44:11 PM

why is Tl⁺ more stable than Tl³⁺?
 
and is Tl more stable than Tl³⁺ ?
i thought that:
cations are smaller than neurtal atoms
and E = z/r => as r decreases, the energy increases so stability decreases so the Tl is more stable than
Tl³⁺. is it correct like this?

Title: Re:thalium stability
Post by: Mitch on June 12, 2005, 01:54:00 PM

What do you mean Tl+ is stable? Does Tl3+ explode or something?

Title: Re:thalium stability
Post by: Rayan on June 13, 2005, 04:45:09 PM

i dont really know what they mean, i was studying for my final exam and it was a question in last year's final!

Title: Re:thalium stability
Post by: Daniel_Imp_Col_UK on June 14, 2005, 12:22:34 AM

Rayan,

I am sure the stability of this lower oxidation state can be explained in terms of the inert pair effect. As we move down the group, bond energies decrease and are not enough to compensate for the promotional energy, and hence the lower oxidation state whereby the S electrons adopt a non bonding role is favoured.

Title: Re:thalium stability
Post by: AgG on November 21, 2005, 04:00:35 AM

Tl+ has a d10 closed shell