Molecular Geometry and Lone Pairs

The video tutorial explains the molecular geometry of the sulfite ion (SO3 2-) using VSEPR theory and AXN notation. It highlights the presence of three oxygen atoms bonded to sulfur and a lone pair of electrons, leading to a trigonal pyramidal shape with bond angles of 109.5°. The tutorial also provides a visual representation of the 3D structure, emphasizing the central sulfur atom and the spatial arrangement of the oxygen atoms and lone pair.

What is the significance of lone pairs in determining the molecular geometry of SO3 2-?

• They attract other atoms closer.

• They repel bonded atoms, affecting the shape.

• They do not affect the geometry.

• They change the color of the molecule.

According to VSEPR theory, what do electron pairs do?

• They attract each other.

• They form new bonds.

• They repel each other.

• They remain stationary.

In AXN notation, what does 'X' represent?

• The central atom.

• The number of lone pairs.

• The number of bonded atoms.

• The total number of atoms.

What is the molecular shape of SO3 2- according to AX3N notation?

• Linear

• Tetrahedral

• Trigonal pyramidal

• Trigonal planar

What is the bond angle in a trigonal pyramidal molecule like SO3 2-?

• 180°

• 90°

• 109.5°

• 120°

In a 3D model of a trigonal pyramidal molecule, what color is typically used to represent the central atom?

• Red

• White

• Blue

• Green

What is the role of the lone pair in the trigonal pyramidal shape of SO3 2-?

• It forms a bond with another atom.

• It attracts the bonded atoms closer.

• It changes the molecule's charge.

• It repels the bonded atoms, altering the shape.

Which of the following is NOT a characteristic of a trigonal pyramidal molecule?

• It has a central atom bonded to three other atoms.

• It has a lone pair on the central atom.

• It has bond angles of 120°.

• It is represented by AX3N notation.

What is the central atom in the SO3 2- molecule?

• Oxygen

• Sulfur

• Nitrogen

• Carbon

What is the overall shape of the SO3 2- molecule?

• Linear

• Trigonal planar

• Trigonal pyramidal

• Tetrahedral