Molecular Geometry and AXE Notation

The video tutorial explains the molecular geometry of aluminum chloride (AlCl3). It begins with the Lewis structure, highlighting that aluminum is an exception to the octet rule. The molecular geometry is described as trigonal planar, with bond angles of 120°. The video also covers the use of steric number and AXE notation to determine molecular geometry, emphasizing the absence of lone pairs in AlCl3.

What is the first step in determining the molecular geometry of a compound?

• Identifying the central atom

• Drawing the Lewis structure

• Calculating the bond angles

• Counting the number of atoms

Why is aluminum an exception to the octet rule in AlCl3?

• It can hold more than eight electrons

• It is stable with only six electrons

• It does not form bonds with chlorine

• It has a higher electronegativity

What is the molecular geometry of AlCl3?

• Tetrahedral

• Bent

• Trigonal planar

• Linear

How do chlorine atoms arrange themselves around aluminum in AlCl3?

• As far apart as possible

• In a square planar shape

• In a straight line

• In a tetrahedral shape

What is the steric number of AlCl3?

• Two

• Three

• Five

• Four

What bond angle is associated with a trigonal planar geometry?

• 109.5°

• 90°

• 120°

• 180°

What does the 'A' represent in AXE notation?

• The type of bond

• The number of bonds

• The central atom

• The number of lone pairs

In AXE notation, what does 'X' stand for?

• The type of bond

• The number of lone pairs

• The central atom

• The number of atoms bonded to the central atom

What is the AXE notation for AlCl3?

• AX2E1

• AX3E0

• AX4E0

• AX2E2

What is the electron geometry of AlCl3?

• Tetrahedral

• Trigonal planar

• Linear

• Bent