The central iodine atom undergoes sp3d hybridization and has 3 lone pairs of electrons and 2 bond pairs of electrons.
Thus, I3− has trigonal bipyramidal geometry and linear shape .
Shape : Linear, I-I-I Bond angle ⇒180∘
The correct shape and I−I−I bond angles respectively in I3− ion are:
Held on 24 Feb 2021 · Verified 6 Jul 2026.
T-shaped; 180∘ and 90∘
Distorted trigonal planar; 135∘ and 90∘
Trigonal planar; 120∘
Linear; 180∘
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