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# Lewis Strutures: Resonance and Formal Charge

CHEM-NCKV7L

Assign formal charges to the $O$ atoms in the peroxide anion and in molecular oxygen.

Also, indicate whether or not the two structures below are resonance structures of each other.

A

The formal charge of $O$ in ${ O }_{ 2 }^{ 2- }$ is -1 while the formal charge in ${ O }_{ 2 }$ is 0. These two sketches are resonance structures of each other.

B

The formal charge of $O$ in ${ O }_{ 2 }^{ 2- }$ is -2 while the formal charge in ${ O }_{ 2 }$ is 0. These two sketches are not resonance structures of each other.

C

The formal charge of $O$ in ${ O }_{ 2 }^{ 2- }$ is -1 while the formal charge in ${ O }_{ 2 }$ is 0. These two sketches are not resonance structures of each other.

D

The formal charge of $O$ in molecular oxygen is -1 while the formal charge of $O$ in the peroxide anion is 0. These two sketches are not resonance structures of each other.