$1$A$.$ Draw two more resonance contributors with filled octets.

$1$B$.$ Analyze your contributors.

$1$C$.$ Add appropriate partial charges based on your contributors.

Omost important

Oleast important

umost Important

Oleast important

Omost important

Oleast important

$1$B$.$ Goal: Analyze contributors.

Approach: start by stating the four criteria in order of importance for ranking resonance contributors

i$.$

ii$.$

iii.

iv$.$

$1$B$.$ Apply criteria to each contributor $($are there formal charges? Do those charges match electronegativity differences? How far apart are opposite charges?$)$ Choose the most important and least important using the bubbles below the structures.

$1$C$.$ Add the appropriate partial charges based on the

filled octet resonance contributors