Formal Charge and Valence Electrons in SO2

Dr. B explains how to draw the Lewis structure for sulfur dioxide (SO2). The video covers the placement of sulfur and oxygen atoms, the distribution of valence electrons, and the formation of chemical bonds. It also discusses the concept of formal charges and how to adjust them to achieve the most stable structure. The tutorial concludes with the finalized Lewis structure for SO2, ensuring all atoms have appropriate formal charges.

How many valence electrons does sulfur have in the SO2 molecule?

• 4

• 5

• 7

• 6

What is the total number of valence electrons in the SO2 molecule?

• 22

• 20

• 18

• 16

Why is sulfur placed in the center of the SO2 molecule?

• It is less electronegative than oxygen.

• It has fewer valence electrons.

• It is more electronegative than oxygen.

• It has more valence electrons.

What adjustment is made to ensure sulfur achieves an octet?

• Add more oxygen atoms.

• Remove electrons from sulfur.

• Share electrons from oxygen with sulfur.

• Add more electrons to sulfur.

What is the formal charge of sulfur before any adjustments?

• -1

• +2

• +1

• 0

What is the formal charge of the first oxygen atom before adjustments?

• +2

• +1

• 0

• -1

What is the formal charge of the second oxygen atom before adjustments?

• 0

• +1

• -1

• +2

What change is made to achieve zero formal charges for all atoms?

• Add more electrons to sulfur.

• Move electrons from oxygen to sulfur.

• Add more oxygen atoms.

• Remove electrons from oxygen.

What is the formal charge of sulfur after rearranging electrons?

• +1

• 0

• +2

• -1

What is the formal charge of the oxygen atoms after rearranging electrons?

• -1

• +2

• 0

• +1