The molecular shape of the triiodide ion, I 3 - , as predicted by VSEPR theory is:

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The molecular shape of the triiodide ion, I3-, as predicted by VSEPR theory is:

Answer: Linear.

A Bent
B Trigonal planar
C Linear
D T-shaped

Correct answer: C. Linear

Explanation: The central iodine in I3- has 2 bond pairs and 3 lone pairs; the lone pairs occupy the equatorial positions of a trigonal bipyramid, leaving a linear ion.

VSEPR theory predicts molecular shape from the number of bonding and lone electron pairs around the central atom.

Concept context

Understand how atoms join to form molecules. Covers ionic and covalent bonding, VSEPR theory, hybridization (sp, sp², sp³), molecular orbital theory, bond polarity, and intermolecular forces like hydrogen bonding.

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The molecular shape of the triiodide ion, I<sub>3</sub><sup>-</sup>, as predicted by VSEPR theory is:

Concept context

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