No, H2O does not have a possible resonance structures.
No, In fact most molecules do not.
no
Yes
There are three possible, equally distributed, resonance structures of nitrate (NO3-).Cf. Related links for the possible Lewis structure of them, on the lowest half of that page.
Because some covalent compounds have more then one valid Lewis dot structure
Start with S on the middel for each one Put the 3 O on top bottom and side of S in each one one O is going to be doubel bonded and with two pairs of dots fore the other two just rotate
Resonance Hybridization
This ionic compound exists of two ions:ammonium, NH4+, is tetraedric (with H at 4 corners and N+ in centre)nitrate, NO3-, is trianular flat with N centred and O(1/3)- at 3 corners)The cristallic structure made of these ions (1 to 1) is trigonal. Nice pictures are at wikipedia, link is to be found at 'Related links' next to this answer, just clicking.[Ball-stick model, red = N, white = H, blue = N)
Resonance structure of butadiene explains H2C. This is known as carbon and hydrogen.
The actual structure
no
no
No, the structure of the compound shifts back and forth from one resonance structure to the other rapidly.
Resonance structure
Usually two way arrows are placed between a molecule's resonance structures to indicate resonance
4
resonance forms are individual lewis structure in cases where two or more lewis structure are equally good descriptions of a single molecule .
detail of isovalent hypercojugation
Sulfur dioxide has three resonance structures. A singly bonded oxygen would have 3 unshared electron pairs while a doubly bonded oxygen would have 2. The sulfur has one pair.
Yes, you may also say Resonance hybrid form.