The electron pair geometry of IO3 and the molecular pair geometry of (iodate ion) IO3- respectively is? Trigonal planar; trigonal planar Tetrahedral; trigonal pyramidal Trigonal bipyramidal; seesaw Tetrahedral; tetrahedral
The Correct Answer and Explanation is:
The correct answer is: Trigonal planar; trigonal planar.
Explanation:
- Electron Pair Geometry of IO3:
Iodate (IO3) has the following structure:- The central iodine atom is bonded to three oxygen atoms.
- The iodine atom follows the octet rule, with three single bonds to oxygen atoms and no lone pairs on iodine.
- Each oxygen atom has one lone pair.
- Molecular Geometry of IO3-:
When the iodate ion (IO3-) is formed, there is an extra electron, making the overall charge negative. This results in the iodine atom having three bonding pairs and one lone pair of electrons. The molecular geometry, which focuses on the arrangement of atoms (ignoring lone pairs), is influenced by the repulsion between the lone pair and bonding pairs. Since there are three bonding pairs and one lone pair, the molecular geometry is trigonal planar as well.
Key Points:
- Electron pair geometry: Describes the arrangement of all electron pairs (both bonding and lone pairs) around the central atom.
- Molecular geometry: Describes the arrangement of only the atoms in a molecule or ion.
In IO3-, the electron pair geometry is trigonal planar because there are three bonding regions (one from each oxygen atom), and the molecular geometry is also trigonal planar since the lone pair on iodine does not alter the overall shape when considering the placement of only the atoms.
