Respuesta :
Formal Charge is Calculated usinf following Formula,
Formal Charge = [# of Valence e⁻] - [# of Lone Pair e⁻ + 1/2 # of Bonding e⁻]
Lets calculate formal charge of Nitrogen in structure 3,
Formal Charge = [5] - [6 + 2/2]
Formal Charge = [5] - [6 + 1]
Formal Charge = [5] - [7]
Formal Charge = -2
You can calculate Formal charge for each atom in each resonating structure.
Also, the structure B dominates because the oxygen atom has a negative charge and being more electronegative in nature it is plausible.
Formal Charge = [# of Valence e⁻] - [# of Lone Pair e⁻ + 1/2 # of Bonding e⁻]
Lets calculate formal charge of Nitrogen in structure 3,
Formal Charge = [5] - [6 + 2/2]
Formal Charge = [5] - [6 + 1]
Formal Charge = [5] - [7]
Formal Charge = -2
You can calculate Formal charge for each atom in each resonating structure.
Also, the structure B dominates because the oxygen atom has a negative charge and being more electronegative in nature it is plausible.

The formal charge is the charge assigned to an atom in a molecule. Second resonance form is most likely to contribute to the structure.
Formal Charge:
It is the charge assigned to an atom in the molecule. It can be calculated by subtracting the Valence electrons in the atom with the total non-bonding electron and bonds.
Formal charge formula,
FC = VE - ( NBE + B)
Where,
VE - valence electron
NBE - Non- bonded Electrons
B - number of bonds
Calculate the formal charge of Nitrogen for 1st resonance structure of [tex]\rm \bold { N_2O}[/tex],
FC = 5 - ( 4 + 2 )
FC = 5 - 6
FC = -1
So, we can calculate the formal charge for other atoms in the molecules using this formula.
To know more about formal charges refer to the link:
https://brainly.com/question/15315809