Selenium Compounds and Molecular Geometry

The video tutorial explains the molecular geometry of the selenate ion (SeO4 2-). It begins with an introduction to the ion and its Lewis structure, followed by a calculation of the steric number and lone pairs on the central selenium atom. The tutorial then describes the tetrahedral molecular geometry and bond angles, using a 3D model for visualization. Finally, the AXE notation is introduced to further confirm the tetrahedral shape, concluding with a summary of the findings.

What is the central atom in the selenate ion (SeO4 2-)?

• Carbon

• Sulfur

• Selenium

• Oxygen

How many atoms are bonded to the central selenium atom in SeO4 2-?

• 4

• 5

• 2

• 3

What is the steric number for the central selenium atom in SeO4 2-?

• 4

• 3

• 2

• 5

What is the molecular geometry of SeO4 2-?

• Bent

• Tetrahedral

• Trigonal Planar

• Linear

What is the approximate bond angle in a tetrahedral molecular geometry?

• 90 degrees

• 180 degrees

• 109.5 degrees

• 120 degrees

How many lone pairs are present on the central selenium atom in SeO4 2-?

• 3

• 0

• 1

• 2

What is the electron geometry of SeO4 2-?

• Octahedral

• Tetrahedral

• Trigonal Planar

• Linear

In the AXE notation for SeO4 2-, what does 'X' represent?

• Central atom

• Number of lone pairs

• Number of bonded atoms

• Total number of atoms

What is the AXE notation for SeO4 2-?

• AX4

• AX3

• AX5

• AX2

What is the molecular geometry indicated by the AX4 notation?

• Tetrahedral

• Trigonal Planar

• Trigonal Bipyramidal

• Linear