What is the electron-pair geometry for Br in BrF5? _ There are lone pair(s) around the central atom, so the geometry of BrF5 is _ B. What is the electron-pair geometry for P in PCl6- ? There are lone pair(s) around the central atom, so the geometry of PCl6- is _
The Correct Answer and Explanation is:
For Br in BrF5:
- Electron-pair geometry: The central bromine atom in BrF5 is surrounded by five fluorine atoms and has one lone pair of electrons. This makes a total of six electron pairs around the bromine atom.
- The electron-pair geometry is based on six electron pairs, which results in an octahedral geometry.
- Lone pairs: There is one lone pair on the bromine atom.
- Molecular geometry: With five bonding pairs and one lone pair, the geometry of BrF5 is square pyramidal.
Explanation:
BrF5 is a molecule where bromine acts as the central atom and is surrounded by five fluorine atoms. The presence of a lone pair causes a distortion in the ideal octahedral geometry, giving it a square pyramidal shape. In an octahedral arrangement, the bond angles would ideally be 90° and 180°, but the lone pair occupies one of the positions, thus altering the structure.
For P in PCl6-:
- Electron-pair geometry: The phosphorus atom in PCl6- is surrounded by six chlorine atoms, resulting in six electron pairs around the central phosphorus atom.
- The electron-pair geometry is octahedral because there are six bonding pairs of electrons.
- Lone pairs: There are no lone pairs on the phosphorus atom, as all six positions are occupied by chlorine atoms.
- Molecular geometry: The geometry of PCl6- is octahedral.
Explanation:
PCl6- is an example of a molecule where the central phosphorus atom is surrounded by six chlorine atoms in a symmetrical arrangement. Because there are no lone pairs on phosphorus, the geometry remains perfectly octahedral, with the chlorine atoms arranged at 90° angles to each other and 180° between opposite atoms.
So, the answers are:
- For Br in BrF5: The electron-pair geometry is octahedral. There are one lone pair around the central atom, so the geometry of BrF5 is square pyramidal.
- For P in PCl6-: The electron-pair geometry is octahedral. There are no lone pairs around the central atom, so the geometry of PCl6- is octahedral.
