Ozone (Durant, 2015, doi: chpz):

• Valence electron equivalent γ: the formal shared electron count at a given atom, obtained by any combination of valid ionic and covalent resonance forms that reproduces the observed charge distribution. If γ(X) > 8, neither form of the octet rule is obeyed and the atom is hypervalent.
• Thus ozone: γ(O) =9.52 (hypervalent, table 2!)
  • NBO Bond indices: C, 3.716; N 3.802; N 2.907; N=N order= 2.368
  • ELF: O, 7.09, 6.27, 7.09 (DFT), 6.78, 6.29, 6.78 (CAS)

FAIR Data: 10.14469/hpc/3476. See also diazomethane.