Formal Charge is calculated by subtracting non bonding valence electron and (1/2) bonding elections from the total number of valence electrons.
s has 6 valence electrons – (4non bonding valence e + 4/2 bonding electrons) =0
0 has 6 velence – ( 4 nonbonding + 4/2 bonding) = 0.
this is the same formal charge on the second o
