Question
Iodine form $\text{I}^-_3$ but $\text{F}_2$ does not form $\text{F}^-_3$ ions. Why?

Answer

$I_2,$ because of the presenve of vacant d-orbitals, accepts electrons from $I^-$ ions to from $\text{I}^-_3$ ions but $F_2$ because of the absence of d-orbitals does not accept electrons from $F^-$ ions to from $\text{F}^-_3$ ions.

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