I3( Tri-iodine) has shape_________?
Correct answer: B. Linear
- A. Trigonal bipyramidal
- B. Linear
- C. Square bipyramidal
- D. Both A and C
Explanation
The triiodide ion, I3-, has five electron domains around the central iodine: two bonding pairs and three lone pairs. The three lone pairs occupy equatorial positions in a trigonal-bipyramidal electron arrangement, leaving the two bonds opposite each other, so the molecular shape is linear. The likely wrong choice is trigonal bipyramidal, which describes the electron-domain arrangement rather than the shape of the atoms.
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About VSEPR Theory
Valence shell electron pair repulsion theory predicts molecular shape by arranging bonding pairs and lone pairs around a central atom to minimize repulsion. Questions cover linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral electron geometries, bond angles and distortions caused by lone pairs. Electron geometry is not always the same as molecular shape.
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