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Explain the following : Iodine forms I...

Explain the following :
Iodine forms `I_3^-` but `F_2^` does not form `F_3^-` ion. Why?

Text Solution

Verified by Experts

Due to the presence of vacant d-orbitals `I_(2)` accepts electrons from `I^(-)` ions to form `1_(3)^(-)` ions. But due to the absence of d-orbitals `F_(2)` does not accept electrons from `F^(-)` ions to form `F_(3)^(-)` ions.
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