Arsenate Ion and AXE Notation

The video tutorial explains the molecular geometry and bond angles of the arsenate ion (ASO4 3-). It begins with constructing a valid Lewis structure and determining the steric number, which leads to identifying the molecular geometry as tetrahedral with bond angles of 109.5 degrees. The tutorial includes a 3D visualization of the structure and discusses the electron geometry, which is also tetrahedral due to the absence of lone pairs. The AXE notation is used to further confirm the molecular geometry.

What is the central atom in the arsenate ion, ASO4 3-?

• Oxygen

• Sulfur

• Arsenic

• Phosphorus

How many atoms are attached to the central arsenic atom in ASO4 3-?

• Five

• Four

• Three

• Two

What is the bond angle in a tetrahedral molecular geometry?

• 90 degrees

• 120 degrees

• 180 degrees

• 109.5 degrees

What is the initial molecular geometry before adding the last oxygen atom in ASO4 3-?

• Tetrahedral

• Trigonal Planar

• Linear

• Bent

What happens to the molecular geometry of ASO4 3- when the last oxygen atom is added?

• It becomes bent

• It becomes tetrahedral

• It becomes trigonal planar

• It becomes linear

What is the electron geometry of ASO4 3-?

• Linear

• Trigonal Planar

• Bent

• Tetrahedral

Why is the electron geometry of ASO4 3- the same as its molecular geometry?

• Due to resonance

• Because of lone pairs

• Due to the absence of lone pairs

• Because of double bonds

In AXE notation, what does 'A' represent?

• Number of lone pairs

• Central atom

• Number of atoms attached

• Bond angle

In AXE notation, what does 'X' represent?

• Number of lone pairs

• Central atom

• Number of atoms attached

• Bond angle

What is the AXE notation for ASO4 3-?

• AX4

• AX5

• AX2

• AX3