2 image sourced
source | link

The idea is that in a resonant structure, all the structures are equally stable -- for instance, in CO3: CO3

, you can see that the formal charges on the Os initially are -1 on 2 of them and 0 on the last; these charges are consistent in each structure. However, in your example, the structures are: enter image description here

The formal charges on the Os in this case are 0 and 0 on the left, as compared to 1 and -1 on the right. These charges aren't the same, so this is a case of more stable structure rather than resonant structure.

Image sources: http://www.chem.ucla.edu/~harding/tutorials/resonance/draw_res_str.html https://s3mn.mnimgs.com/img/shared/content_ck_images/images/HNO2.png

The idea is that in a resonant structure, all the structures are equally stable -- for instance, in CO3: CO3

, you can see that the formal charges on the Os initially are -1 on 2 of them and 0 on the last; these charges are consistent in each structure. However, in your example, the structures are: enter image description here

The formal charges on the Os in this case are 0 and 0 on the left, as compared to 1 and -1 on the right. These charges aren't the same, so this is a case of more stable structure rather than resonant structure.

The idea is that in a resonant structure, all the structures are equally stable -- for instance, in CO3: CO3

, you can see that the formal charges on the Os initially are -1 on 2 of them and 0 on the last; these charges are consistent in each structure. However, in your example, the structures are: enter image description here

The formal charges on the Os in this case are 0 and 0 on the left, as compared to 1 and -1 on the right. These charges aren't the same, so this is a case of more stable structure rather than resonant structure.

Image sources: http://www.chem.ucla.edu/~harding/tutorials/resonance/draw_res_str.html https://s3mn.mnimgs.com/img/shared/content_ck_images/images/HNO2.png

1
source | link

The idea is that in a resonant structure, all the structures are equally stable -- for instance, in CO3: CO3

, you can see that the formal charges on the Os initially are -1 on 2 of them and 0 on the last; these charges are consistent in each structure. However, in your example, the structures are: enter image description here

The formal charges on the Os in this case are 0 and 0 on the left, as compared to 1 and -1 on the right. These charges aren't the same, so this is a case of more stable structure rather than resonant structure.