Molecular Geometry and Valence Electrons

The video tutorial explains the Lewis structure for phosphorus pentaiodide (PI5), detailing the electron configuration and bonding. It describes how phosphorus can have an expanded octet and the process of distributing valence electrons among iodine atoms. The molecular geometry is identified as trigonal bipyramidal, with bond angles discussed. The AXE notation is used to confirm the molecular geometry, and the video concludes with a summary of the findings.

What is the chemical formula for phosphorus pentaiodide?

• PI3

• PI5

• P2I5

• P5I

How many valence electrons are present in a single iodine atom?

• 7

• 6

• 8

• 5

What is the total number of valence electrons in the PI5 molecule?

• 35

• 30

• 40

• 45

Why can phosphorus have more than eight valence electrons in PI5?

• Due to its position in the periodic table.

• Because it forms double bonds.

• It cannot have more than eight.

• Because it can have an expanded octet.

What is the formal charge on each atom in the PI5 Lewis structure?

• +1

• 0

• -1

• +2

What is the molecular geometry of PI5 when all iodine atoms are added?

• Octahedral

• Tetrahedral

• Square planar

• Trigonal bipyramidal

What are the bond angles between the equatorial atoms in PI5?

• 90°

• 109.5°

• 120°

• 180°

What does the 'X' represent in the AXE notation for molecular geometry?

• Number of double bonds

• Number of valence electrons

• Number of atoms bonded to the central atom

• Number of lone pairs

In the AXE notation for PI5, what does the 'E' represent?

• Number of valence electrons

• Number of bonded atoms

• Number of double bonds

• Number of lone pairs

What is the AXE notation for the molecular geometry of PI5?

• AX6

• AX5

• AX3

• AX4