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# Electron density maps

Chemistry discussion, revision, exam and homework help.

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1. Electron density maps

Surely the answer is C? Since it is the only electron density map (for Iodine) in the list that contains 5 shells..
2. Re: Electron density maps
The rings don't represent shells. I'd say A.
3. Re: Electron density maps
(Original post by Farseer)
The rings don't represent shells. I'd say A.
Oh! Why do you think its A?
4. Re: Electron density maps
(Original post by xXxiKillxXx)
Oh! Why do you think its A?
Big anion = polarisable

small cation = polarising

So I'd expect the cation to be stealing the electron density from the I-

B is impossible (a negative charge wont be attracting the electrons from a cation)

C is unlikely given above

D is possible but suggests a nearly covalent bond - I think you'd need a very high charge density cation (like Al3+) to get that much polarisation

so go with A
5. Re: Electron density maps
(Original post by Farseer)
Big anion = polarisable

small cation = polarising

So I'd expect the cation to be stealing the electron density from the I-

B is impossible (a negative charge wont be attracting the electrons from a cation)

C is unlikely given above

D is possible but suggests a nearly covalent bond - I think you'd need a very high charge density cation (like Al3+) to get that much polarisation

so go with A
This is correct (except that D represents covalent bonding with a dipole)

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Last updated: May 3, 2012
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