QQuestionChemistry
QuestionChemistry
What is the 3D structure (Molecular Geometry & Shape) and Geometry Name (e.g., Trigonal Planar) of I^−3 (triiodide ion)?
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Answer
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Step 1:
Determine the number of electron groups around the central atom (Iodine). In I^−3, there are 7 electrons from Iodine and 3 negative charges, which means 3 more electrons. In total, there are 7 + 3 = 10 electrons around Iodine. Since Iodine needs 8 electrons to achieve a stable electron configuration, it will use all 10 electrons for forming electron groups.
Step 2:
Distribute the electron groups around the central atom. Iodine has 5 energy levels, so it will form 1 lone pair and 3 bonding pairs with the other Iodine atoms.
Step 3:
Determine the molecular geometry. With 1 lone pair and 3 bonding pairs, the molecular geometry is a see-saw shape.
Step 4:
Determine the 3D shape (or spatial arrangement) of the molecule. The 3D shape of the molecule is also a see-saw.
Step 5:
Identify the geometry name. Since there are 4 electron groups (1 lone pair and 3 bonding pairs) around the central atom, the geometry name is "See-saw."
Final Answer
The molecular geometry of I^−3 (triiodide ion) is a see-saw shape, and the 3D shape or spatial arrangement is also a see-saw. The geometry name is "See-saw."
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