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+ Inorganic chemistry
+ Ions
+ Chemistry
+ Iodine
+ Organic chemistry
Posted by
Mounir Shita

Why is an iodine ion more stable than a chloride ion?

Bernd Leps  Follow

HI is a stronger acid than HCl, so the conjugate base I- will be weaker and stable ion than Cl- ion.

The effective nuclear chare of I-..ion is higher than that of Cl-ion. So the electron charge density of I- ion is strongly attracted by its nucleus than that in Cl-. So I- is less reactive than Cl-.

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Ayaz Wasay  Follow

I think you mean to compare iodide (I-) (never say iodine ion because a halide ion with -1 O.S. always end with a suffix -ide) and chloride (Cl-) ions.

A general comparison between the stability of two ions can be made by considering a few factors, provided they either belong to the same group or same period.

  • Size is use to determine the stability among anions belonging to same group.
  • Electronegativity is used to determine the stability among anions of different groups.
  • I- and Cl- belong to same group, so we should compare their sizes. I- is larger in size as it belongs to the 5th period, the negative charge will be more dispersed or spread in the I- compared to Cl-, thus making I- more stable than Cl-.

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