Molecular Geometry and AXE Notation

The video tutorial explains how to draw the Lewis structure for the iodine dibromide cation (IBr2+). It begins by counting the valence electrons, placing iodine at the center, and arranging bromine atoms on either side. The video details the process of completing octets and calculating formal charges, ensuring the structure is correct. It also covers the molecular geometry, identifying it as bent, and the electron geometry as tetrahedral. The tutorial concludes with the use of AXE notation to confirm the molecular geometry.

What is the total number of valence electrons in the IBr2+ ion?

• 18

• 20

• 24

• 22

Why is iodine placed at the center of the IBr2+ Lewis structure?

• It is the least electronegative element.

• It has the highest atomic number.

• It has the smallest atomic radius.

• It is the most electronegative element.

How many valence electrons are used to complete the octets of the bromine atoms in IBr2+?

• 12

• 20

• 16

• 8

What is the formal charge on the central iodine atom in the IBr2+ ion?

• 0

• +1

• -1

• +2

What is the molecular geometry of the IBr2+ ion?

• Tetrahedral

• Bent

• Linear

• Trigonal planar

What is the approximate bond angle in the bent molecular geometry of IBr2+?

• 120 degrees

• 109.5 degrees

• 90 degrees

• 180 degrees

What is the electron geometry of the IBr2+ ion?

• Linear

• Octahedral

• Trigonal planar

• Tetrahedral

In AXE notation, what does 'E' represent?

• Number of bonds in the molecule

• Number of electrons in the outer shell

• Number of atoms bonded to the central atom

• Number of lone pairs on the central atom

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

• Total number of electrons

• Central atom

• Lone pairs

• Atoms bonded to the central atom

What is the AXE notation for the IBr2+ ion?

• AX2E

• AX3E2

• AX2E2

• AX3E