Lewis Structures of Xenon Trioxide

Dr. B explains how to draw the Lewis structure for xenon trioxide (XeO3). Starting with the calculation of total valence electrons, the video demonstrates placing electrons around xenon and oxygen atoms. Initial formal charge calculations reveal issues, prompting a revision of the structure by forming double bonds. The revised structure achieves zero formal charges, indicating it as the best Lewis structure for XeO3. The video emphasizes the importance of formal charges in determining the most stable structure.

How many total valence electrons are present in xenon trioxide (XeO3)?

• 24

• 30

• 26

• 28

What is the initial problem identified with the Lewis structure of XeO3?

• The structure is not symmetrical.

• There are not enough electrons to complete the octet.

• Xenon has more than eight valence electrons.

• Oxygen has too many electrons.

What is the formal charge on oxygen in the initial Lewis structure of XeO3?

• +1

• -1

• -2

• 0

What is the formal charge on xenon in the initial Lewis structure of XeO3?

• +3

• +2

• 0

• -1

Why is the initial Lewis structure of XeO3 not considered the best?

• The formal charges are not zero.

• There are too many electrons.

• The octet rule is not satisfied.

• The structure is not symmetrical.

What change is made to the Lewis structure to achieve zero formal charges?

• Removing electrons.

• Changing the central atom.

• Introducing double bonds.

• Adding more electrons.

How many double bonds are introduced in the revised Lewis structure of XeO3?

• Two

• Four

• One

• Three

What is the formal charge on oxygen in the revised Lewis structure of XeO3?

• -2

• 0

• +1

• -1

What is the formal charge on xenon in the revised Lewis structure of XeO3?

• +3

• -1

• 0

• +1

Why is the revised Lewis structure considered the best for XeO3?

• It uses fewer electrons.

• It satisfies the octet rule.

• The formal charges are zero.

• It is symmetrical.